United Kingdom, April 23 -- Zara Larsson kissed her best friend's boyfriend at 16.

The 28-year-old pop star has revealed that she kissed her friend's boyfriend at a New Year's Eve party, after he'd spent all night flirting with her.

She told the Call Her Daddy podcast: "I just kissed him back because I was messy like that. And I was 16 and really drunk."

Zara said the situation was made worse when another girl at the party filmed the kiss and sent the video to her friend before she had the chance to come clean.

She said: "The f***** up thing about this, though, was that the girl whose [house] we had had the party at, she filmed this, and I didn't know. So before I got the chance to tell my friend what happened the next day, she had al...