Paris Hilton's Sin City Website Launch Party

Doing her best to grow her fan base, Paris Hilton took to Sin City for a party celebrating the official launch of ParisHilton.com on Saturday night (January 16).

The former "Simple Life" star was all decked out in a tight-fitting black dress, hitting up the Hard Rock Hotel & Casino's Vanity nightclub for the evening fete.

Tweeting throughout the course of her Las Vegas outing, Miss Hilton first wrote, "At dinner, I have a hot crew with me. Tonight is going to be so much fun at Vanity!"

After finishing up her meal, the hotel heiress then tweeted, "Just did the red carpet at Vanity. Wo many flashes, my eyes hurt. haha. We be clubbin....."

Celebrity Gossip

Enjoy the pictures of Paris Hilton out at Vanity nightclub (January 16).