The Kid Laroi's TikTok star girlfriend Katarina Deme rocks a floral bikini in a hotel room selfie... as his Justin Bieber collaboration Stay tops the charts

Her boyfriend's hit single Stay ft. Justin Bieber continues to top Australia's ARIA charts after three weeks on the top spot.

And on Monday, The Kid Laroi's TikTok star girlfriend Katarina Deme appeared to be in a great mood as she posed for an Instagram selfie.

The 17-year-old, who recently celebrated her one-year anniversary with Laroi as well as his chart success, rocked a floral bikini as she relaxed on vacation with her beau.

Happy: The Kid Laroi's TikTok star girlfriend Katarina Deme appeared to be in a great mood on Monday as she posed for a bikini selfie on vacation with her beau

Happy: The Kid Laroi's TikTok star girlfriend Katarina Deme appeared to be in a great mood on Monday as she posed for a bikini selfie on vacation with her beau

Katarina wore sunglasses and minimal makeup for the summery look, and smiled in the mirror while Laroi, also 17, sat on the bed behind her.

The rapper, also 17, finally landed his first No. 1 single on the ARIA charts earlier this month.

The 80s synth-pop song was produced by Perth-based hitmakers Michael 'Finatik' Mule and Isaac 'Zac' De Boni.

Summer ready! Katarina worse sunglasses and minimal make-up for the summery look, and she smiled in the mirror while her boyfriend appeared to sit on the bed behind her

Summer ready! Katarina worse sunglasses and minimal make-up for the summery look, and she smiled in the mirror while her boyfriend appeared to sit on the bed behind her

Top spot! The rapper, also 17, finally landed his first No. 1 single on the ARIA charts earlier this month. Pictured with his collaborator, Justin Bieber

Top spot! The rapper, also 17, finally landed his first No. 1 single on the ARIA charts earlier this month. Pictured with his collaborator, Justin Bieber

Immediately after its release, Stay topped multiple Spotify charts around the world and is currently climbing up the Australian iTunes charts.

In the music video, the teen pop star and Bieber dance in an empty station. It's cut in with scenes of a melodramatic Laroi racing through Los Angeles.

The rapper previously said he wanted to showcase his home country's rap scene to the world.

Cute: Katarina and The Kid Laroi recently celebrated one year as a couple

Cute: Katarina and The Kid Laroi recently celebrated one year as a couple 

'I don't think America is completely switched on to how big [and] great the Australian music scene and culture is, but I think that's kind of my job to shed light,' he told Triple J last month.

The Waterloo-born star said he's long dreamed of putting Sydney's rap scene on the map 'the way Drake did with Toronto'.

Born in Canada, rapper Drake often gushes about his home city of Toronto in his music, and even boasts a number of Toronto-themed tattoos.

Goals: The Waterloo-born star said he's long dreamed of putting Sydney's rap scene on the map 'the way Drake did with Toronto'. Pictured alongside Katarina

Goals: The Waterloo-born star said he's long dreamed of putting Sydney's rap scene on the map 'the way Drake did with Toronto'. Pictured alongside Katarina  

The Kid Laroi's girlfriend Katarina Deme rocks a floral bikini in hotel room selfie

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