Sexy Cindy! Ms Crawford, 51, poses TOPLESS on the beach while modeling 'mom jeans' after flaunting her bikini body in St Barts

Cindy Crawford is proving that some models never go out of style.

The 51-year-old siren looked as fetching as ever as she posed topless on the beach in an Instagram snap shared on Friday.

This comes after the mother-of-two showed off her bikini body while on vacation with her husband Rande Gerber as well as their two children Kaia and Presley in St Barts.

Babe on shore: Cindy Crawford looked as fetching as ever as she posed topless on the beach in an Instagram snap shared on Friday

Babe on shore: Cindy Crawford looked as fetching as ever as she posed topless on the beach in an Instagram snap shared on Friday

Racy: The beauty wore her highlighted locks down and had on pretty makeup. But no one was looking at the Vogue model's face as she let her sideboob show

Racy: The beauty wore her highlighted locks down and had on pretty makeup. But no one was looking at the Vogue model's face as she let her sideboob show

Update your denim collection with some Re/Done jeans like Cindy's

Cindy Crawford really does redefine the term 'mom jeans'.

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Here she is rocking a pair of Re/Done jeans on the beach. The label has been spotted on the likes of Gigi Hadid, Kendall Jenner, Emily Ratajkowski, Rita Ora and Cindy's daughter Kaia Gerber, so they can't all be wrong!

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Cindy wore her highlighted locks down and had on pretty makeup.

But no one was looking at the Vogue model's face as she let her sideboob show with chest down on the sand.

Jeans that she called 'mom jeans' could be seen low on her hips. Her caption read: 'Forever in denim. Thanks @VogueMagazine! #momjeans.'

Spring break: The 51-year-old supermodel and her 54-year-old husband were on vacation with their two children, 15-year-old Kaia and 17-year-old Presley in St Barts on Tuesday

Spring break: The 51-year-old supermodel and her 54-year-old husband were on vacation with their two children, 15-year-old Kaia and 17-year-old Presley in St Barts on Tuesday

This comes after Cindy looked toned in a two piece as she hit the beach with Rande.

The supermodel uploaded a photo of she and her 54-year-old husband enjoying their St Barths vacation on Thursday afternoon.

'Enjoying spring break with my honey!,' she put as the caption.

Cheers:  Crawford uploaded this photo with husband Gerber during their spring break vacation to St Barths

Cheers: Crawford uploaded this photo with husband Gerber during their spring break vacation to St Barths

The stunning mother-of-two has been seen in a series of bikini's on the trip, but kept a white cover-up on for their meal.

She wore big sunglasses in the photo, her first social media post since arriving in the Caribbean island.

Their children Kaia, 15, and Presley, 17, were not in the photo despite having being spotted in the island. 

In the photo, they appeared to cheers with glasses of wine, despite Rande having the hugely popular Casamigos tequila empire he co-owns with pal George Clooney.

Rande and George worked on Casamigos, which loosely translates to 'house of friends,' for two years before it went on the market in 2013.

The premium tequila began as a private batch for their friends and family before they decided to make it available to everyone. 

Idyllic: Rande posted this photo of the beach in St Barths on Monday

Idyllic: Rande posted this photo of the beach in St Barths on Monday

Cindy and Rande's children are following in their parents' footsteps, each becoming models in their own right.

Presley was recently honored for being an emerging talent in the industry at the Daily Front Row Los Angeles Fashion Awards.

Daughter Maia has already starred in a Marc Jacobs campaign for the brand's Daisy perfume.

Fashionable family: Kaia and Presley Gerber pose with their parents on the red carpet for the Daily Front Row Los Angeles Fashion Awards on Saturday in West Hollywood

Fashionable family: Kaia and Presley Gerber pose with their parents on the red carpet for the Daily Front Row Los Angeles Fashion Awards on Saturday in West Hollywood

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