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They've been flaunting their new romance on social media ever since going public last month.
And on Monday, tennis bad boy Nick Kyrgios, 26, treated his new girlfriend Costeen Hatzi to a fancy meal at Melbourne's Nobu during a break from the Australian Open.
Nick reposted a picture of their fancy meal on his Instagram stories, captioning his post: 'Only the best for my mini'.
Date night! Tennis bad boy Nick Kyrgios treated new girlfriend Costeen Hatzi to a fancy meal at Nobu in Melbourne on Monday, during a break from the Australian Open
While out, the pair dined on food including oysters.
Nick was supported by model Costeen, 21, earlier this week as he worked up a sweat on the practice court at the Australian Open at Melbourne Park.
On Monday, the pair were seen sharing a kiss courtside.
