She is best known for being the girlfriend of tennis bad boy, Nick Kyrgios.

But Costeen Hatzi is well on her way to becoming a big star on her own. 

The 22-year-old business owner-turned-social media influencer looked incredible as she stripped down to a revealing purple bikini during a new photoshoot on Wednesday to promote popular tanning brand, Bondi Sands. 

Costeen showed off her toned tummy and slender legs in a strapless crop top and matching briefs.  

The bronzed beauty wore her raven locks out in beachy waves and sported a flawless makeup palette. 

The brunette worked on the campaign with hair stylist Dimitri Kyvetos, makeup artist Jack Cail and friend Sasha Morpeth.

She posted about half a dozen behind the scenes photographs of the photoshoot.

'Day two with Bondi Sands. Had the best couple of days with such a fun team,' she captioned the images. 

Nick and Costeen's relationship is going from strength-to-strength after they revealed their romance in December 2021. 

Nick recently admitted he and Costeen would like to have four children before quickly removing the post. 

After reaching the highly-coveted WAG status, Costeen has recently enjoyed the benefits of social stardom.

Nick has given his seal of approval of his girlfriend's affiliation with the popular brand. 

'The girl doing big things. Proud of you baby, we are really taking over,' he said this week. 

He has happily credited Costeen's positive influence with helping him produce the best year of his tennis career in 2022.