British tennis star Katie Boulter shows off her HUGE diamond engagement ring while out for a walk with Aussie fiance Alex de Minaur

British tennis star Katie Boulter has flashed her stunning diamond engagement ring while out for a walk with her new Aussie fiance Alex de Minaur.

The tennis power couple, who have been dating since 2022, appeared to be enjoying quality time in Melbourne together on Saturday before the upcoming Australian Open.

Boulter, dressed all in green, happily flashed her massive diamond ring as the couple were pictured on a morning walk.

The 28-year-old announced on social media last month that she had become engaged to long-term boyfriend and world No 9 De Minaur.

Boulter and De Minaur thrilled their fans with an Instagram snap in which the Brit had her left arm around the neck of her 25-year-old beau revealing that she was wearing a stunning engagement ring on her wedding finger.

They captioned the post: ‘We’ve been keeping a small secret…’

Tennis power couple will play in the Australian Open later this month 

 Having initially met on the professional tennis circuit, the pair ran into each other while out for a 6am coffee.

It was here that their relationship blossomed and Boulter admitted that was when she knew he was the one.

‘We bumped into each other at six in the morning and ended up getting a coffee. From that moment, I knew I was in it for the long haul,’ Boulter had previously told The Age.

Both enjoyed excellent 2024 seasons on the WTA and ATP Tours with Boulter winning titles in Nottingham and San Diego.

De Minaur ended his year with a huge win at the Ultimate Tennis Showdown bouncing back from his disappointing ATP Finals in Turin where he failed to win a match.

And Boulter certainly in excellent form while booking Great Britain’s spot in the quarter-finals of the United Cup with victory over Australia’s Olivia Gadecki last week.

Boulter duly delivered with a dominant 6-2 6-1 victory against 97th-ranked Gadecki in Sydney.

The tie pitted the newly-engaged Boulter against fiance Alex De Minaur, who is Australia’s number one player, and she said in her on-court interview: ‘I’m very happy to start my new year like that.

The couple have been dating since 2022 and recently announced their engagement 

Both players are in tremendous form ahead of the Australian Open

‘I feel like I’ve actually lost a lot of sleep recently over the thought of playing my fiance in doubles so I’m so tired and just very happy to get through this rubber.

De Minaur said last week that he is feeling back to his best after being plagued by a hip injury in his break-out 2024 season suffered during his Wimbledon run in July.

‘It’s definitely the best I felt since Wimbledon,’ de Minaur said on Saturday.

‘Very happy with how the body’s moving, how it’s feeling.

‘It’s been a long time coming but it’s feeling the best shape it has been in a very, very long time.’

 The Australian Open begins on January 12.