Zara Larsson makes shocking confession about being filmed with best friend's boyfriend at 16

Swedish singer Zara Larsson has been reflecting on being a tearaway teen - and how a 'weird mistake' led to her being exiled by her pals.

The 28-year-old hitmaker admitted she used to be 'really messy' when she was younger, although she compares herself to 'a granny' these days.

One particular incident during her adolescence, which involved her former best friend's fella, ended up being quite a defining moment for Larsson.

During an appearance on the Call Her Daddy podcast, she explained that the original version of her track 'Girl's Girl' was actually inspired by this moment.

In the song, she belts out lyrics such as: "But you're with somebody else, I know that girl / Since we were ten and 12 / Yes, I'm aware, but I don't care / 'Cause temptation is getting to me.

"I wanna be a girl's girl / But what happens when a girl's girl wants the boy? I know that she's my friend, but I just can't avoid / The way I feel about you, if I had the choice / You'd be all mine."

So, I'm sure you can see where this is going...

Larsson revealed she was 'cut off' by her friends as a teenager due to the indiscretion (Iwi Onodera/Redferns)

The music star sat down with Alex Cooper earlier this week to chat about her incredible rise to fame, which began after she won Sweden's version of Britain's Got Talent when she was just 10.

Larsson went on to bag a record deal when she was 14-years-old, before going on to become a global success.

While she was carving out her career in the music industry, she was also juggling typical teenage dilemmas - such as causing murders after snogging her best mate's boyfriend.

She explained the guy in question was 'flirting with her all night' at a New Year's Eve party, despite being in a relationship with her close pal.

Larsson, who was 16 at the time, said she was actually 'really interested in his friend' but ended up having an impromptu smooch with him as the bash was wrapping up.

The singer said it was 'one of her worst mistakes in life' (YouTube/Call Her Daddy)

"I was picking up my jacket, everyone was already downstairs," she told Cooper. "We were going somewhere else. He just kind of started kissing me.

"And I just kissed him back, because I was messy like that - and I was 16 and really drunk."

Unbeknownst to Larsson, this wasn't a secret she was going to be able to keep, as someone had sneakily recorded them playing tonsil tennis.

She explained: "The f***ed 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 already got the video sent to her.

"But the truth is I wasn't really in love with him or interested in him - it was this weird mistake that happened. But obviously, seeing it..."

The 'On My Love' singer revealed that her pal 'just cut her off', as did the rest of her friend group, as she added: "And I was just like a floating piece of trash in the universe."

She clarified that although these events 'inspired' her song 'Girl's Girl', the lyrics 'definitely wasn't the truth'.

Larsson said her pal 'didn't speak to her for four years' after she locked lips with her man, but explained that they late reconnected.

"Now it’s okay and everyone’s like on good terms," she added. "It was one of my worst mistakes in life. Like, it truly was. At 16, I just...if I could take it back, I would so, so, so bad.

"But I also have to like forgive myself for it because again, this is more than 10 years ago now, and I was just really stupid and messy.

"And also I found out that I can’t drink. I just can’t. My morals and my just sense of self, like it just goes out the window."