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Jennifer Aniston

Clasos.com / Splash News

You didn't really think Jennifer Aniston would spend her celebrity Christmas in the cold, right?

The soon-to-be Mrs. Justin Theroux was snapped with her man looking effortlessly sexy on their holiday vacation in Cabo San Lucas, Mexico.

The super-hot twosome was spotted sunbathing on Christmas Eve together. Jen wore a solid pink barely-there bikini and sarong for the occasion, while her fiancé went shirtless, flaunting his abtastic bod.

The former Friends star looked relaxed and happy as she enjoyed quality time with her beau, showing off her fab and fit tummy that's toned to perfection thanks to a healthy diet and a strict workout regime (she's a self-described Pilates devotee!).

No doubt Jen was the hottest 43-year-old babe on the beach!

So much for those pesky pregnancy rumors.