Oh, behave! 

Elizabeth Hurley shared a playful video from her glamorous vacation with her friend and former co-star Joan Collins in St. Tropez on Instagram Monday, showing off her skimpy beige bikini. 

The British beauty created an Instagram Reel recapping the trip with the simple caption ““#sttropez ????.” 

In the video, Hurley, 58, wore the same gold crochet cover-up she was spotted in while traveling earlier this month and showed off the brown bikini with gold hardware details underneath.

In one snap, she posed for a sweet selfie alongside her former “Royals” co-star Collins, 90, who wore a floral-printed turquoise caftan. 

The honey-hued bikini is from the “Gossip Girl” alum’s own Elizabeth Hurley beach swimwear line, of course.

The toffee-colored string metallic top with gold chain detailing and matching bottom (both $88) appears to be a favorite with the mom of one, judging by her many photos in the sultry style. 

Fans flocked to Hurley’s Instagram comments to compliment the ageless “Austin Powers” actress. 

“I sure hope you didn’t to do a deal with the devil to stay looking 20+ years younger than what your passport says,” one fan joked.

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“Wow!!! ???? This girl still looks like she’s in her 20s! What a dream girl,” a second said of the mom of one, who shares son Damian, 21, with the late businessman Steve Bing.

“How? How do you still look that good?” one confused commenter asked. 

While Hurley is certainly “aging backwards,” she isn’t getting any more shy. In fact, the British beauty posed naked in a pool earlier this week.

We’re certain fans aren’t complaining about her stripped-down moments.