Paris Hilton dispelled pregnancy rumours by spending this past weekend partying hard in Las Vegas.

The heiress was photographed last week wearing a green dress which hugged her suspiciously rotund belly, prompting speculation that she is expecting a baby with her boyfriend, Good Charlotte’s Benji Madden.

However, she was spotted drinking pink champagne with dinner at Tao club while treating contestant on her MTV reality show Paris Hilton’s My new BFF.

Wearing a ruffled black dress with a belt around her waist, Paris spent the evening gulping down vodka and tequila, reports People. "She's clearly not pregnant," said a guest at the party.

She repeated the festivities again the following night at Tao wearing a maxi dress, with no sight of a protruding tummy.

See the pictures of bump-free Paris partying this weekend here.