Did Paris Hilton Blab Christina Aguilera's Baby News?

'Congratulations to the most beautiful pregnant woman in the world,' Hilton tells crowd at Aguilera's party — although singer hasn't officially announced pregnancy.

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Paris Hilton just can't keep a secret. While attending a Christina Aguilera-sponsored party at LAX nightclub in Las Vegas September 9, the

heiress got on the microphone and congratulated Aguilera on her baby news...even though the pop star has never publicly admitted she's pregnant.

"Congratulations to the most beautiful pregnant woman in the world, you're gorgeous," Hilton, 26, said to the packed crowd, while Aguilera, 26 (whose video "Candy Man" is up for Best Director at the MTV VMAs; see "MTV VMA Race Is On: Justin Timberlake, Beyonce Lead Nominations"), sat nearby in uncomfortable silence.

Don't count on an invitation to the baby shower, Paris.

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