Caught in the Act!
08/26/2010 AT 06:00 AM EDT
Katy Perry, feting her new album Teenage Dream with the first-ever bash at New York's newly opened Gansevoort Park Avenue Hotel. Guests congregated on the roof for the Candyland-themed soiree, which included a candy bar and dancing Gummi Bears. In keeping with the sweet theme, "Katy walked in to the party with a lollipop in her mouth," an onlooker says, adding that she cuddled with fiancé Russell Brand all night.
Kim Kardashian and boyfriend Miles Austin, partying with pals at Drai's Hollywood. "They were having an amazing time together, dancing and hanging out with friends," an onlooker says. Also there: Whitney Port.
Mary J. Blige and husband Kendu Isaacs, celebrating newlywed Swizz Beatz's YRB magazine's September issue at a Ciroc vodka sponsored bash. The couple sat in the VIP area near the deejay booth and bobbed their heads to many of the singer's classic tracks before sneaking out a side entrance.
By JENNIFER GARCIA, CARLOS GREER and CHRISTINE KILPATRICK