Jennifer Aniston reveals pregnant belly in funny new ad

According to tabloid magazine covers, Jennifer Aniston has been pregnant, oh, about a million different times. Now the newly-engaged actress is having fun with those pesky rumors in a new ad.

See more: Aniston, Justin Theroux celebrate engagement with Courtney Cox

The funny new video for Smartwater, featuring cameos by Ryan Seacrest and Jimmy Kimmel, is designed to look like security footage from the "Friends" star's home. The 43-year-old celeb plays a fictionalized version of herself and pokes fun at the endless pregnancy chatter by arriving home looking normal with her rock-hard abs, then removing a girdle and revealing a huge pregnancy belly. "How are my little triplets doing?" she says, resting a hand on her stomach.

Later, while Aniston is by her pool, Kimmel — who plays her son — comes outside in his water wings and wants to go swimming. "I think you're ashamed of me," Kimmel — who is trailed by another Aniston offspring, an alien — says to his "mom" as she tries to shoo him back inside. "Please before anyone sees you, will you please get inside?" she says. "Hurry. Come on — scoot!"

Another fun bit has Aniston is getting ready for bed. Staring into her bathroom mirror, she says, "Good night, Rachel" and pulls off a wig, revealing her "real" hair -- a hideous dark and curly 'do styled in two pigtails on the top of her head.

See more: Aniston wants a destination wedding

Since Aniston announced her engagement to Justin Theroux in August, a whole new crop of pregnancy rumors have started. No word on when the couple will tie the knot, but according to reports she wants to have a destination wedding with only her closest friends in attendance.