Ariana Grande's first UK concert from her Sweetener tour was jam-packed with fans ready to sing and dance their hearts out.

And, two of those fans were Millie Bobby Brown and Harry Styles, who were spotted having a great time by eagle-eyed Grande fans in the crowd at London's o2 Arena.

In a couple of videos posted to Twitter, Styles – wearing all white jeans and a top – is seen fully going for it, raising a glass to the air while singing the high notes to 'Dangerous Woman'.

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Cast your eye just a few steps to the right and the Stranger Things star is there too, wearing a cream turtle-neck jumper and a jacket robed over her shoulders with her hair tied in a cute homage-to-Ariana-Grande ponytail, singing and dancing.

Later on in the evening, the pair were then captured in conversation with one another – presumably in shared awe of Grande's four octave vocal range – and having a laugh together.

This fusion of two fan favourites, three if you count the fact they were donning metaphorical bunny ears through their appearance at Grande's gig, naturally went down very well on Twitter.

Grande played at the London venue as the first stop of the European leg of her tour. She will head to Sheffield, Birmingham and Glasgow later in the month.

The singer is also scheduled to deliver a special headline performance at Manchester Pride this weekend. It will be the first time she's returned to sing in the northern city since the 2017 One Love Manchester concert, which she organised to raise funds for the families affected by the terrorist bombing at her Dangerous Woman concert at the Manchester Arena.

Millie Bobby Brown's Style File
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Olivia Blair
Talent Editor
Olivia Blair is Talent Editor at Hearst UK, working predominantly across Cosmopolitan, ELLE, Esquire and Harper's Bazaar. Olivia covers all things entertainment and has interviewed the likes of Margot Robbie, Emma Stone, Timothée Chalamet and Cynthia Erivo over the years.