Rebecca Romijn showed off her banging bikini body on vacation with husband Jerry O'Connell and their twins on Saturday, Jan. 2. Credit: Mary Clavering/Young Hollywood/Getty Images

Fun in the sun! Rebecca Romijn showed off her killer bikini body on vacation on Saturday, January 2.

"Contemplating the jump," the Librarians actress, 43, captioned an Instagram snap that showed her in a two-piece bikini, along with one of her 7-year-old twin daughters, standing on a cliff.

In another photo, she smiled as she displayed her tight abs while being held up by her husband Jerry O'Connell's feet, lying in the sand, doing the "superman challenge."

The blonde beauty also shared a sweet pic of her other daughter, as they lay on the sand with their feet in the water.

The actor, 42, also posted a cute snap of his wife with their twin girls, Charlie and Dolly, walking and playing in the sand.

Hey @bravoandy @andersoncooper @instasuelos @kellyripa #SupermanChallenge you're up! #CirqueDuBainDuSoleil

A photo posted by Rebecca Romijn (@rebeccaaromijn) on

Last April, the Stand By Me actor told Andy Cohen on Watch What Happens Live that their girls know that their mom used to be married to John Stamos.

"Full House is on a continual loop," O'Connell said. "Because they expressed, like, real feelings for the character of Uncle Jesse, I said, 'You know girls, I gotta tell you something. This is gonna be crazy…'"

Contemplating the jump

A photo posted by Rebecca Romijn (@rebeccaaromijn) on

Romijn and O'Connell married in 2007 after she divorced Stamos in 2005 after five years of marriage.

Sign up now for the Us Weekly newsletter to get breaking celebrity news, hot pics, and more delivered straight to your inbox!