The former Friends star flaunted her fabulous figure south of border while vacationing in Cabo San Lucas with her fiancee Justin Theroux and a bunch of their celebrity friends.
Jen and Justin were joined by Courteney Cox, Howard Stern, Beth Ostrosky, Jimmy Kimmel and his wife on the trip.
Jen credits her buff body to sticking to a strict workout routine and lots of cardio and yoga.
"I work out almost every day, at least five or six days a week," she told InStyle last year. "I do 40 minutes of cardio: spinning, running, the elliptical or a combination of all three. Then I do Pilates one day a week, and I do yoga in addition to that, three days a week."
Her dedication to fitness is definitely paying off!