Fresh from her tour, Fergie, hanging out with friends at New York hotspot Butter in a black-and-white floral dress. The singer wasn't the only attraction at the packed club: Jamie-Lynn Sigler, in a red flowy blouse, denim shorts and gold gladiator sandals, hung out with Michelle Trachtenberg. (Sigler's boyfriend, Scott Sartianoco-owns the club, while Trachtenberg is dating a Butter manager.) The ladies got busy on the dance floor, rocking to songs by Jay-Z ("Money Ain't A Thing") and Timbaland ("Give It To Me"). Meanwhile, rapper Lil Jon stood atop the banquette dancing – all with a large entourage in tow.