Olivia Wilde pokes fun at her ‘shameless’ butt tattoo in bikini photo: ‘The horror’

This star is showing off some birthday booty.

Olivia Wilde might have turned 39 on March 10, but she kept the celebratory vibes going yesterday — and showed off the “tramp stamp” butt tattoo she got when she was just 13 years old.

Posing with her back to the camera in a black-and-white Instagram photo, the “Don’t Worry Darling” star wears a white string bikini top and a thong bottom that reveals a dragon tattoo on the top of her right butt cheek.

“39 and feeling fine,” Wilde captioned the post. “Thanks for the birthday love. I milked it for way too long and it’s been great.”

She added, “Here’s to whatever’s next. Probably not another tramp stamp but who knows.”

The “House” star added the hashtags “#shameless,” “#howdareshe” and “#thehorror” to her cheeky photo.

While her dragon tattoo might come as a surprise to some fans, she actually spoke about the ink in a 2017 interview with Craig Ferguson.

“I have one really bad one,” she said when the late-night host asked if she had any tattoos, admitting that she got “a tattoo of a dragon” when she was just 13.

“You hand over cash, they’ll tattoo a cat,” she said about her shocking underage experience, adding she “was in New York City and I thought it was a great idea, it had a lot of meaning at the time but now it’s hideous.”

As for the location, Wilde was hesitant to admit where the dragon was located, eventually revealing it was on her “lower, lower, lower back.”

“It’s not a tramp stamp!” the “Babylon” star said. “It’s over to the right. It’s an ass stamp, which is probably a lot classier.”

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While she hasn’t be so eager to display her “ass stamp,” Wilde has showed off her other tattoos recently, including the names of her children, Daisy, 6 and Otis, 8, and illustrations of their star signs constellations.

Her birthday post follows the sexy bikini snaps the actress and director shared during a girls’ trip with Molly Howard, who is the CEO of fashion brand La Ligne and also appears in her newest pic.

Perhaps the actress will celebrate turning 40 with an actual lower back tattoo next year.