See Jennifer Aniston With a Baby Bump!

It's the baby bump the whole world has been waiting for: Jennifer Aniston's!

Alas, the 43-year-old Wanderlust star — set to wed beau Justin Theroux — isn't with child just yet. But Aniston straps on a convincing pregnant belly in a hilarious new viral video for smartwater.

With cameos by Ryan Seacrest and Jimmy Kimmel, the video reveals so-called "security tapes" starring the beloved star (and smartwater spokeswoman) — who crashes a sports car, fills her swimming pool with smart water and sports a bowling-ball sized baby bump.

Jen Aniston Smart Water

Another pseudo-shocker caught by security cameras? Aniston's world-famous hair is a wig!

See a "pregnant" Jennifer Aniston reveal her "real" hair and much more in this clip!

Sign up now for the Us Weekly newsletter to get breaking celebrity news, hot pics and more delivered straight to your inbox!

Want stories like these delivered straight to your phone? Download the Us Weekly iPhone app now!