Keibler, 33, and the Olympic gold medalist, 27, are ringing in the holiday down in Cabo San Lucas, Mexico, along with Keibler's man George Clooney.
The gorgeous beauty tweeted a photo of herself posing with her beer pong partner, writing, "Dominating. #TeamBaltimore #geometry m_phelps00 #goodtimes."
Keibler also shared a snapshot of her and pals Dave and Odette Annable, who are also enjoying the sun and sand in Cabo.
According to the New York Post, Keibler and Clooney also met up with Jennifer Aniston and her fiance Justin Theroux on Dec. 27 over dinner at El Dorado, the luxury Mexican resort where the stars are staying.
- Leigh Blickley
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