Never one to pass by a shameless publicity op, headline-hungry Paris Hilton spilled the beans on new-best-friend Christina Aguilera at a glitzy party in Las Vegas. The diva had gone out of her way to hide the bump but Paris inadvertently revealed all by grabbing a mike and blurting out, 'congratulations to the most beautiful pregnant woman in the world, Christina Aguilera...You're gorgeous.' Ouch.