[Submit your own Stalker sightings to stalker@gawker.com] July 28th @ 9:30pm: Partied to a performance from Taylor Momsen's band, The Pretty Reckless, with Ed Westwick, Chace Crawford, Jessica Szhor, Matthew Settle, Connor Paolo, and Michelle Trachtenberg for her Sweet 16!

["Gossip Girl" actor Chace Crawford in boring old jeans and a T-shirt while Joanna Garcia gets to wear a fun dress and everything. Not fair. Image via Splash]

The 2009 Mercedes-Benz Polo Challenge held its inaugural match at the Bridgehampton Polo Club on Saturday. Polo heartthrob Nacho Figueras, Chace Crawford, chef Marcus Samuelsson, Kyle MacLachlan and Desiree Gruber, Star Jones and boyfriend Herb Wilson, and a handful of reality TV personalities (Jill Zarin, PC Peterson, Kourtney Kardashian) turned out for the action. Cityfile's roving correspondent Douglas Marshall took a few minutes to catch up with Beth Ostrosky, who turned 37 last week but gets a gold star for still fitting into her short shorts from high school.

Super-publicist Peggy Siegal is turning 62 today. David Hasselhoff turns 57. Donald Sutherland is 74. Producer Mark Burnett is 49. Phyllis Diller is 92. Defense attorney Peter Neufeld is turning turns 59. Linda Gibbs, the Deputy Mayor of Health and Human Services, is turning 50 today. Comedian Beth Littleford is 41. View producer Bill Geddie is turning 54. Lucie Arnaz, the daughter of Lucille Ball and Desi Arnaz, is 58. Author and blogger Cory Doctorow is 38. And old-time TV host Art Linkletter turns 97 today. A list of people with birthdays this weekend—including Chace Crawford, Ian Schrager, and Steve Forbes—is below.

Kim Cattrall breaks up with her man, Will and Jada Smith have lots of sex, Chace Crawford is moving out of Ed Westwick's place to get his own apartment downtown and Megan Fox is shopping for a house.

Twilight's Robert Pattinson and Kristen Stewart are pregnant, Angelina Jolie and David Beckham are starring in an Armani ad together, Britney's sporting a new "spare tire," Michael Bay made Megan Fox wash his Ferrari and Joyce DeWitt got a DUI.

[Remember this (especially the end)? Anyway, that's Chace Crawford on the "Gossip Girl" set; image via INF]

Robert Pattinson riding a bike around Central Park on the set of Remember Me, and later standing with co-star Emilie de Ravin ... Shaquille O'Neal leaving his hotel in Midtown ... Mariah Carey filming the music video for her latest single, "Obsessed," including one scene with her dressed up dressed up as Eminem ... Leighton Meester, Chace Crawford, and Ed Westwick on the set of Gossip Girl ... and Rihanna walking into lunch yesterday at Philippe, and then turning up at the Gramercy Park Hotel last night for Allegra Versace's 23rd birthday party.

Chace Crawford has a new swimsuit model love interest, Susan Boyle freaks out in a fit of rage on strangers and cops in London, Jon and Kate are manipulating their kids, Rihanna will get virtually naked in a new Kanye video, and Anna Wintour wants to be ambassador to Britain.

Bruce Willis and wife Emma Heming walking on the Upper West Side ... Kelly Ripa shopping with her kids in Soho ... Ivanka Trump walking into NBC ... Matt Damon getting in an SUV with wife Luciana and daughters Isabella and Gia ... Cynthia Nixon with with Christine Marinoni talking on her cell phone ... Hugh Jackman eating popsicles in the park with his kids, Oscar and Ava ... Taylor Momsen getting out of a car ... Karolina Kurkova walking downtown ... Ashlee Simpson leaving the Children's Museum of Manhattan on West 83rd Street ... Jesse James getting in an SUV ... Chace Crawford, Jessica Szohr and Ed Westwick walking around together in Soho ... Rihanna going into a movie theater downtown ... Michelle Williams and Ryan Gosling shooting scenes for their new movie in Queens ... and Anne Hathaway walking her dog in the East Village.

Today we have some bad news about Footloose, some good news about The Fighter, and some unexpected surprises from old friends.

Brad Pitt getting into a car in Soho ... Kate Hudson watching the game at Yankees Stadium ... Hugh Jackman walking in the West Village with son Oscar ... Tim Robbins riding a bike in the Village ... Gisele Bundchen getting out of a taxi ... Madonna walking into the Kabbalah Center with sons David and Rocco ... Heidi Montag and Spencer Pratt arriving at JFK ... Naomi Watts playing in the park with son Sasha ... Michelle Williams getting coffee with daughter Matilda and a friend ... Jennifer Love Hewitt talking on her cell phone in the meatpacking district, and later shopping in Soho with boyfriend Jamie Kennedy ... Rihanna going to Da Silvano for lunch ... Chace Crawford hanging out on the set of Twelve ... and Justin Timberlake running to his car in Tribeca.

Rihanna shopping in Soho, and later standing under an umbrella outside Bar 89 on Mercer Street ... Chloe Sevigny carrying a bunch of shopping bags downtown ... Kate Bosworth walking with James Rousseau on the Lower East Side ... Venus Williams getting in a taxi outside of Whole Foods ... Chace Crawford hanging out on the set of Twelve with Emma Roberts ... Chanel Iman talking on her cell phone ... Kim Kardashian walking into the Gramercy Park Hotel ... Bethenny Frankel heading into a book signing at the Time Warner Center ... Jessica Biel walking downtown ... and Victoria Beckham going shopping in Chelsea.

• The drama surrounding fashion's most famous headbutt continues: Kiefer Sutherland says he was "defending the honor" of Brooke Shields by attacking Jack McCollough, since Jack had knocked Brooke over and then failed to apologize. Brooke and Jack, however, say the push never even happened, and Kiefer was running around drunk and "looking for something to smack." The police are now investigating the matter, since apparently there aren't more important crimes to be tackling right now. [TMZ, TMZ, NYDN, P6]
• Anna Wintour and Rihanna were acting like old pals at a Costume Institute afterparty on Monday night, which certainly bodes well for Rihanna's chances of landing a Vogue cover in the future. [NYDN]
• Lindsay Lohan was supposed to chaperone her little sister to a party at LA's Roosevelt Hotel on Monday night, but ended up "getting up close and personal" with ex-boyfriend Jared Leto instead. [E!, P6]
• Casey Johnson, meanwhile, showed up to the same party and was overheard telling a friend that she and Courtenay Semel have broken up, again. [P6]

Adrien Brody talking on his cell phone in the East Village ... Mark Ronson having lunch at Da Silvano with his sister Samantha and Q-Tip ... Ashlee Simpson carrying son Bronx outside their hotel in Midtown ... Kate Hudson getting out of a taxi on Mercer Street ... Brad Pitt leaving the Standard Hotel ... Chace Crawford and 50 Cent hanging out on the set of Twelve ... Michelle Williams and Spike Jonze playing with Matilda in Brooklyn ... Ryan Gosling getting out of a cab ... America Ferrera shooting scenes for Ugly Betty ... Kim Kardashian going into Butter ... and Madonna leaving dinner at Nobu 57.

• Did Beyoncé really send a look-alike to stand in for her at an art museum in Vienna so she could go shopping instead? That's what many Austrians seem to think, and the museum now says it plans to issue a protest. And here we were thinking decoy body doubles were just for presidents and mafia kingpins. [AFP]
• James Gandolfini erupted at a group of paparazzi outside the Waverly Inn the other night. Fortunately—for the drama-loving masses, at least—they kept their cameras on during the episode and it was all caught on tape. [TMZ]
• Real-life roommates Chace Crawford and Ed Westwick might be splitting up, since Chace is reportedly looking for a loft of his own downtown. [P6]
• Mel Gibson and Russian singer Oksana Grigorieva made their first public appearance together last night at an X-Men screening in LA. [People]
• Strippers at Sapphire East's opening were supposedly told not to take their clothes off until after Samantha Ronson finished her set, since she's "so girl-crazy, she can't concentrate." [P6]

Kate Hudson walking in Soho with friends ... Anne Hathaway leaving the Apple store in Soho with boyfriend Adam Shulman ... Zoe Kravitz and Chace Crawford going to lunch together ... Angelina Jolie filming scenes for Salt in a subway station ... Jeremy Irons sitting on a motorcycle in Midtown ... Sarah Jessica Parker and Matthew Broderick leaving their Village townhouse ... Alexis Bledel getting in a car outside the Tribeca Film Festival ... Mary-Kate Olsen walking in Soho ... Madonna leaving the Kabbalah Center on East 48th Street with daughter Lourdes ... Jennifer Aniston and Jason Bateman kissing on the set of The Baster in Midtown... and Kim Kardashian leaving the Waverly Inn and sitting with Russell Simmons in the backseat of his Maybach.

• Are Michelle Williams and Spike Jonze planning to head down the aisle this summer? That's what the Star claims, since the two have been together "almost a year" and supposedly "don't see why they should wait much longer." As good a reason as any! [Star]
• Sam Ronson changed her relationship status on Facebook to "It's complicated," and says she and LiLo have started talking again, which may mean they're getting back together. [Us]
• Mary-Kate Olsen "kept touching" actor Bradley Cooper at a Tribeca Film Festival party, which could be a sign that they might be dating. [NYDN]
• Parker Posey showed off her new man at the festival, too. She's dating a sculptor named Scott Lenhardt. [NYM]

Gisele Bundchen leaving her apartment in the West Village ... Kanye West carrying a duffel bag at JFK ... Liam Neeson leaving the Broadhurst Theatre on West 47th Street ... Music producer Rick Rubin holding a shopping bag outside his hotel in Soho ... Jennifer Lopez posing on the sidewalk after an appearance on Good Morning America ... Kim Kardashian talking on her phone at JFK ...... Solange Knowles crossing the street in Midtown ... Chace Crawford on the set of his new movie, Twelve, in Central Park ... and Ciara leaving dinner at Da Silvano.

• Brad Pitt and Angelina Jolie went to the Stop & Shop in Oyster Bay with two of their kids on Saturday and were "very friendly" to employees of the store. Please try to contain your amazement. [Us]
• Lindsay Lohan must be hard up for cash, since she's reportedly in discussions to star in a topless show in Las Vegas. Even worse: She seems to think it will "really revitalize her career and give her some serious theater cred." [Fox]
• Early Show anchor Julie Chen and her boss/husband, CBS chief exec Les Moonves, are expecting their first child this October. [P6]
• Speaking of kids, Amy Winehouse's rep says that the rumors the singer is adopting a child from the Caribbean are untrue. Be thankful for that! [DE]