Jennifer Aniston: Bikini Sunbathing with Shirtless Justin Theroux!

Jennifer Aniston wears a pink bikini top while sunbathing with her shirtless fiance Justin Theroux on Christmas Eve Monday (December 24) in Mexico.

Later in the day, the 43-year-old actress changed into a green strapless bikini top.

Jen and Justin arrived in the sunny locale the day before to spend the holidays together in Cabo San Lucas.

Jen‘s We’re The Millers co-star Emma Roberts recently talked about working with her in the flick.

“Jennifer Aniston is a genius. I’ve been such a fan of hers for so long, so to get to work with her was one of those dream come true, check-off-my-list kind of things that I’ve always wanted,” Emma told the Huffington Post.

30+ pictures inside of Jennifer Aniston and Justin Theroux sunbathing…