Kevin Spacey fights for the right to stay in the glass closet. Nick Cannon confirms that Mariah's having twins. David Arquette confirms that he's having a breakdown. Thursday gossip knows that you know that he knows, but what about her?

Senator and former presidential candidate John Kerry turns 66 today. Actress, comedian and TV host Mo'Nique is turning 42. Jermaine Jackson is 55. Motley Crew's Nikki Sixx is 51. Montana Senator Max Baucus turns 68 today. Mos Def is turning 36. One-time reality TV star Lisa Gastineau is 50. Bay boy Brit chef Marco Pierre White is 48. And '80s actresses Teri Garr and Donna Mills are turning 65 and 67, respectively. A handful of weekend birthdays are below.

Lindsay Lohan buying a bottle of water downtown ... Mary-Kate Olsen leaving a yoga class in SoHo ... Christina Applegate arriving at ABC studios in Midtown ... Sienna Miller shopping at Williams-Sonoma in SoHo ... Mark McGrath walking downtown ... Renee Zellweger getting in an SUV after an appearance on Good Morning America ... Liev Schreiber carrying his bike into his apartment in NoHo ... Amanda Seyfried shooting scenes for Letters to Juliet in Bryant Park ... Nikki Sixx leaving his hotel ... Blake Lively hailing a cab, and later talking to Sebastian Stan on a Gossip Girl shoot at the Brooklyn Botanical Gardens ... Viola Davis walking in Tribeca ... and Whitney Port going grocery shopping at the Citarella in SoHo.

Remember John Kerry? Apparently he ran for president in 2004 or something. Anyway, he's celebrating his 65th today. Mos Def is turning 35. Faded '80s actresses Teri Garr and Donna Mills are 64 and 66, respectively. British chef Marco Pierre White is 47. Motley Crew bassist Nikki Sixx is turning 50. And Jermaine Jackson is 54.