Those Paris Hilton pregnancy rumours continue to fly.

The latest round of gossip has been prompted by the socialite's apparently out-of-character decision to lay off the booze.

“She's not drinking. It's the first time I've never seen her do that," says a source quoted by E! Online's The Awful Truth.

Last month, Paris' camp branded reports that she was carrying a motherload courtesy of boyfriend Benji Madden as "absolutely false" following the publication of photos of her with a prominent tummy.

Paris joins that ever-present list of rumoured-to-be-expecting stars – which currently also includes the perpetually 'pregnant' Eva Longoria and Jennifer Garner.

All three potential mommies-to-be were snapped going about their business in L.A yesterday – click for the pics and be sure to tell us if you spy a baby bump!