A short history of JoJo: She released her self-titled debut in 2004 when she was 13 and scored a Top 20 hit with the Kidz Bop-perfect anthem "Leave (Get Out)." In 2006, she released her follow-up, The High Road, which contained the Top 5 hit "Too Little Too Late." Along the way, she has suffered record-company bullshit and picked up a legion of stans. Last year, she released "a riff on Drake's "Marvin's Room," in which she said "fuck." Maturation had set in.

Uma Thurman and son Levon Roan eating pizza on the street ... Hugh Jackman heading home after a trip to the gym ... Diana Ross leaving a building on Fifth Avenue ... JoJo walking into her hotel in Tribeca ... Taylor Momsen hanging out with her mom on the set of Gossip Girl in Queens ... Matthew Broderick walking son James to school ... Catherine Zeta-Jones leaving her apartment on the Upper West Side ... and Lady Gaga arriving at Radio City Music Hall last night.

Katie Holmes, actress and Bride of Scientology, turns 31 today. Hard-charging hedge fund manager Dan Loeb is turning 48. Brad Pitt turns 46. Steven Spielberg is turning 63. Christina Aguilera is celebrating her 29th birthday today. Dan Klores, the publicist turned documentary filmmaker, is marking his 60th. The head of the American Federation of Teachers, Randi Weingarten, is 52. Memorial Sloan-Kettering president (and Nobel Prize winner) Harold Varmus is turning 70. Troubled rapper DMX is 39. Keith Richards of the Rolling Stones is 66. Ray Liotta is turning 55. Model agency owner Faith Kates is 52. And former Miss USA Tara Conner is turning 24 today. A bunch of weekend birthdays is below.