Olivia Wilde Shows Off Her Incredibly Toned Bikini Body — and Son Otis’ Bare Butt!

Olivia Wilde
Olivia Wilde worked her toned body in a tangerine bikini in Hawaii on Saturday, Dec. 12. AKM-GSI

One hot mama! Olivia Wilde flaunted her taut and toned bikini body while vacationing in Hawaii with her family — including fiancé Jason Sudeikis and their 19-month-old son, Otis.

PHOTOS: Sexiest Bikini Bodies of 2015

On Saturday, December 12, the Meadowland actress, 31, modeled a tangerine two-piece with a halter top and cheeky bikini bottoms — all the better to show off her gorgeous frame. The brunette beauty also added a floppy hat and a striped towel as a sarong.

Olivia Wilde slipped into a printed, bustier-style bikini on Sunday, Dec. 13, in Hawaii. Splash News Online

After a midday break from the beach, Wilde, who welcomed Otis in April 2014, made a quick change into a slate swimsuit, covered up by a sheer white top with tassels. She also rocked an underwire bra top and bottom in "Rainbow Multi" by Mara Hoffman that Sunday.

PHOTOS: Stars' Pregnant Bikini Bodies

The beauty even took to the high seas for a little paddleboarding action, dressed in a printed tank and square shades.

Olivia Wilde
Olivia Wilde stand up paddle boards in Maui. Splash News Online

Wrapping up the weekend, the House alum took to Instagram to share a snap from her travels that featured Otis staring out at the ocean — butt-naked! Appropriately, she captioned the pic, "Naked Cowboy."

Naked Cowboy. (Apparently unsuitable for those unaware that humans have butts)

A post shared by Olivia Wilde (@oliviawilde) on

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

Want stories like these delivered straight to your phone? Download the Us Weekly iPhone app now!