(Editor's note: The VMAs are a big assignment, and with this year's show taking over Las Vegas all week long, our friends at Us Weekly are helping us make sure we've got every glittering inch of the Strip covered. You'll see their celebrity reporting here at MTV.com this week, and you'll find our music reporting over at UsMagazine.com.)

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 [article id="1566507"]"MTV VMA Race Is On: Justin Timberlake, Beyonce Lead Nominations"[/article]), sat nearby in uncomfortable silence.

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

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