Dustin Martin has made a surprise cameo on a video posted to tennis legend Serena Williams’ official Instagram account.

The 23-time grand slam champion is holidaying in the Maldives with husband and Reddit co-founder Alexis Ohanian.

Williams shared a video of her day at the beach to her 11.8 million followers on Tuesday.

It begins with the American giving a lengthy critique of her chicken sandwich on Turkish bread before cutting to Ohanian trying his hand at DJing.

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Then things get interesting - and very weird - all at once.

So while NRL stars are getting arrested in Bali this off-season, Dustin Martin is chilling on a beach and going boating with Serena Williams. #NRL #AFL pic.twitter.com/2YkCbAfRZl — Brendan Bradford (@1bbradfo) November 12, 2019

Ohanian declares, ‘This is kinda easy, I hate to say it’.

A relaxed-looking Martin, mid-sip, laughs and turns in Williams’ direction, who also chuckles, before taking another slurp of his refreshing beverage.

The video then switches to another brief clip showing Martin and Ohanian about to board an inflatable hot dog, with Williams declaring, ‘It is hot dog time’, before panning to a woman named Jess.

It is unclear whether Williams and the Tigers champion are friends or if they simply bonded at the exclusive resort.

And judging by the Twitter reaction to Dusty’s random appearance, AFL fans want answers.

Can someone please explain why Dustin Martin is on holidays with Serena Williams? I need to know. — умереть (@7elevenlatte) November 12, 2019

Dustin Martin on Serena Williams’ insta story is the weirdest cross over ever — Aleks (@a_cul21) November 12, 2019

Can someone please explain to me how Serena Williams and Dustin Martin have ended up on a holiday together? — Amanda (@atrafic) November 12, 2019