Costeen Hatzi watches Nick Kyrgios play at Wimbledon

Costeen Hatzi looks effortlessly cool as she sports Gucci sunglasses to watch her tennis bad boy Nick Kyrgios play at Wimbledon

She’s in London supporting her boyfriend Nick Kyrgios.

And Costeen Hatzi looked effortless cool as she stood by the tennis bad boy at Wimbledon on Saturday.

The tennis WAG looked effortlessly cool an oversized white shirt and Gucci glasses as she watched Kyrgios beat Serbian Filip Krajinović in three sets.

Costeen Hatzi (pictured) looked effortlessly cool as she supported her tennis bad boy boyfriend at Wimbledon on Saturday

Costeen Hatzi (pictured) looked effortlessly cool as she supported her tennis bad boy boyfriend at Wimbledon on Saturday

The Aussie beauty, 22, opted for black trousers and a monochrome look as she wore her brunette hair down and loose.

Earlier she was spotted walking hand-in-hand with her beau, opting for more designer brands with a Louis Vuitton bag and black baseball cap.

Meanwhile, Nick paired red Air Jordan Mids while green shorts, a hoody and a Jordan baseball cap.

The Aussie beauty, 22, opted for black trousers and a monochrome look as she wore her brunette hair down and loose

The Aussie beauty, 22, opted for black trousers and a monochrome look as she wore her brunette hair down and loose

Earlier she was spotted walking hand-in-hand with her beau, opting for more designer brands with a Louis Vuitton bag and black baseball cap. Pictured with Nick

Earlier she was spotted walking hand-in-hand with her beau, opting for more designer brands with a Louis Vuitton bag and black baseball cap. Pictured with Nick  

She wore an oversized white shirt and Gucci glasses as she watched Kyrgios beat Serbian Filip Krajinović in three sets

 She wore an oversized white shirt and Gucci glasses as she watched Kyrgios beat Serbian Filip Krajinović in three sets

Making the most of the south London sun, Costeen sat front row

Making the most of the south London sun, Costeen sat front row

Making the most of the south London sun, Costeen looked delighted as she sat front row.

It comes as 27-year-old Nick, who hails from Canberra, shared pictures on Instagram on Friday of himself and influencer Costeen checking out Buckingham Palace. 

‘Happiness,’ Nick captioned his post, adding a love heart and lock emoji. 

In the image, Nick and Costeen pose up in matching tracksuits outside of Buckingham Palace.

The athlete went Instagram official with Costeen last December, following his split from longtime girlfriend Chiara Passari

The athlete went Instagram official with Costeen last December, following his split from longtime girlfriend Chiara Passari 

Costeen has been right by Nick's side throughout his run at Wimbledon

 Costeen has been right by Nick’s side throughout his run at Wimbledon

Nick and Costeen enjoyed sightseeing in London this week

Nick and Costeen enjoyed sightseeing in London this week 

‘Tourist photos,’ university graduate Costeen commented underneath. 

Costeen has been right by Nick’s side throughout his run at Wimbledon. 

The athlete went Instagram official with Costeen last December, following his split from longtime girlfriend Chiara Passari.

Costeen watched all of Nick’s games during the Australian Open at Melbourne Park in January, and has been described as a key member of his team.

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