Hilary Duff and Mike ComrieDuff and Comrie are all smiles on a night out at Butter in New York City on Nov. 20, 2007.

Penélope Cruz, Ashton Kutcher, and Demi MooreKutcher holds hands with two gorgeous gals: his wife, Demi Moore, and his friend Penélope Cruz while leaving Butter in New York City on June 26, 2007.

Justin TimberlakeTimberlake looks sexy as ever exiting his own Upper East Side restaurant, Southern Hospitality, in New York City on Aug. 16, 2007.

Minka Kelly and John MayerMayer holds on to the arm of his latest main squeeze as they enter the exclusive doors of Butter in New York City on Dec. 3, 2007.

Hayden Panettiere and Ne-YoNe-Yo plays the part of Panettiere’s personal hero while leading her away from the paparazzi and inside Butter restaurant and lounge in New York City on Nov. 20, 2007.

Pamela AndersonAnderson takes a little break from partying on Dec. 31, 2007 at Pure nightclub in Las Vegas.

Mariah CareyMariah Carey is the toast of Vegas on Dec. 31, 2007 at Tao. Mimi shows some serious leg in a little white dress that amplifies her curvy assets.

Paris HiltonHilton shows off her moves in a sparkly purple little number at Pure in Las Vegas. She and her sister, Nicky, were spotted sipping champagne at the Sin City hot spot on Dec. 31, 2007.

Vanessa Minnillo and Nick LacheyMinnillo and Lachey celebrate both of their birthdays together by partying all night long at club LAX in Las Vegas on Nov. 15, 2007.

Ashlee Simpson and Pete WentzThis duo always hits the DJ booth. Simpson and Wentz count down the seconds till 2008 at the Shore Club in Miami on Dec. 31, 2007.