Ride 'em, cowgirl! Cheeky Alessandra Ambrosio goes wild as she straddles her male pal's back during fun weekend trip in Las Vegas

It's surprising she has time to get away for some fun, given that she's one of the world's most successful supermodels and also a mother-of-two.

But Alessandra Ambrosio proved she manages to combine working hard and playing hard as she blew off some steam during her wild weekend trip to Las Vegas.

Leaving her inhibitions at the door, the 35-year-old model donned her best cowboy stance as she placed herself on the only boy allowed on her girly trip, TV presenter Matheus Mazzafera.

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Sinning: Alessandra Ambrosio, 35, donned her best cowboy stance as she placed herself on the only boy allowed on her pal Matheus Mazzafera's back during wild Vegas weekend 

Sinning: Alessandra Ambrosio, 35, donned her best cowboy stance as she placed herself on the only boy allowed on her pal Matheus Mazzafera's back during wild Vegas weekend 

Wearing a monochrome ensemble consisting of a black vest top and skinny white jeans, the Brazilian stunner sat on Matheus as he crawled forth.

With her mouth wide open, the short clip saw her enthusiastically raise her hand to smack his bottom, before the action repeated in reverse.

Captioning the image: 'Me and my bestie @matmazzafera When in Vegas' she seemed in high spirits, while her pal didn't seem to mind as he looked ahead in the Vegas casino and concentrated as he carried Alessandra's svelte frame.

And this isn't the first dose of fun she's had since arriving in the party-heavy state as she turned up to the Intrigue nightclub in the Wynn Las Vegas the night before.

Riding in style: Wearing a monochrome ensemble consisting of a black best top and skinny white jeans, the Brazilian stunner sat on Matheus as he crawled forth

Riding in style: Wearing a monochrome ensemble consisting of a black best top and skinny white jeans, the Brazilian stunner sat on Matheus as he crawled forth

'Me and my bestie': The short clip saw her enthusiastically raise her hand to smack his bottom with her mouth wide open, before it repeated the clip in reverse

'Me and my bestie': The short clip saw her enthusiastically raise her hand to smack his bottom with her mouth wide open, before it repeated the clip in reverse

Like a true modelling sensation, she showed off her amazing body in a daring low-cut asymmetrical black dress as she partied at the Intrigue nightclub in the Wynn Las Vegas.  

The unusual number featured a short hemline on the left and floor-length on the right.

She completed her look with her brunette locks tied back in a bun and gave her 5ft 9in height a boost with a pair of black strappy sandals.

Woah momma! Alessandra shows off her amazing figure in a sexy black dress as she arrives at the Intrigue nightclub in Las Vegas

Woah momma! Alessandra shows off her amazing figure in a sexy black dress as she arrives at the Intrigue nightclub in Las Vegas

The model was joined by a host of gal pals in Sin City, including fellow Brazilian models Fernanda Motta, Renata Maciel, Gabi Lopes and Michelli Buback.

Las Vegas was a short trip from Los Angeles, where Alessandra has lived for years with her fiance Jamie Mazur and their two children Anja, six, and Noah, four.

The Victoria's Secret model admitted in a recent interview she had actually lost her engagement ring from the businessman, who runs denim brand RE/Done.

Leggy: The mother-of-two showed off the figure that won her a Victoria's Secret contract in the unusual number, which featured a short hemline on the left and floor-length on the right

Leggy: The mother-of-two showed off the figure that won her a Victoria's Secret contract in the unusual number, which featured a short hemline on the left and floor-length on the right

Taking the plunge: The Brazilian was enjoyed a weekend off parenting as she escaped to Sin City with her girlfriends

Taking the plunge: The Brazilian was enjoyed a weekend off parenting as she escaped to Sin City with her girlfriends

What a beauty: The Brazilian supermodel completed her look with her brunette locks tied back in a bun

What a beauty: The Brazilian supermodel completed her look with her brunette locks tied back in a bun

Here come the girls: Alessandra was joined by a large group of pals, including Brazilian models Fernanda Motta, Renata Maciel, Gabi Lopes and Michelli Buback

Here come the girls: Alessandra was joined by a large group of pals, including Brazilian models Fernanda Motta, Renata Maciel, Gabi Lopes and Michelli Buback

She told Vogue in an interview last month: 'I actually lost my engagement ring a few years ago, so I do want to replace it. I don't know if he's going to make me replace it myself since I lost it.' 

Despite being engaged for eight years, Alessandra said she and Jamie aren't even close to setting a wedding date because they're both so busy with their respective careers.

She told Extra! in December: 'When I do the wedding, it's gonna be very special, so I want to take time for that.'

Party time! Alessandra and her friends swilled vodka and Red Bull as they hit the club

Party time! Alessandra and her friends swilled vodka and Red Bull as they hit the club

Are you feeling lucky? Alessandra and her pals made sure they had time to enjoy a spot of gambling on the slot machines

Are you feeling lucky? Alessandra and her pals made sure they had time to enjoy a spot of gambling on the slot machines