Britney Spears Parties with JC Chasez in New York City

She’S in New York City for Fashion Week, but Britney Spears (left last night with baby Sean Preston) could use some fashion tips. The pop tart was spotted in the bathroom of the Carlyle Hotel on Friday about 11 p.m., primping with friends in front of the mirror. Our spy overheard Spears complain, "Y’all, I feel old! I’m 24, y’all. I feel old." She was wearing "a red tank minidress, no bra, and huge platform shoes" and had "nappy hair extensions." Spears asked our tipsters, "What should we do in New York? This place [the Carlyle] feels old." Informed that the hotel is a local institution, Spears opted to party at Tenjune instead.

While Britney was partying with JC Chasez in New York City, Brian Spears, Britney’s brother, was at Park Avenue Country Club laughing at the K-Fed commercial during the Super Bowl, and downing pitchers of light beer during the game.

It’s just a rumor, but a friend of Kevin Federline says:

"Britney was into threesomes and girls." He says Britney would often invite a bunch of girlfriends over to the couple’s house to party. An insider who knows the couple well says that over the course of a night, Britney would often disappear into a bedroom with her girlfriends. "Sometimes it was three girls, and sometimes there were more like six," the insider says. "I heard about her being with girls at least 20 times while they were married." A friend says that Kevin plans to use tales of Britney’s secret sexual exploits and drug use in his battle for custody of their sons, Sean Preston, 17 months, and Jayden, 5 months. "She has told Kevin more than once that she is sexually attracted to women and men equally," says the pal. "He wants to show that she’s not such an angel after all."

If you can believe a friend of Kevin Federline.

Below you can see a girl pulling at Britney’s thong while she sits with her fat butt bulging out of her tight jeans. Britney is still wearing her Star of David Jewish necklace, and yet there are reports that Britney and Isaac Cohen have split.