Bruno Mars is picky about who he collaborates with.

Bruno Mars

Bruno Mars

The 'Locked Out Of Heaven' hitmaker would turn down a "sweet cheque" if he doesn't feel right about the collaboration.

He said: "I just don't want to feel gross. It's as simple as that. I don't want to feel gross, I don't want to regret any decisions. Even if I turn down a sweet cheque because I don't want to be on that billboard, hawking some s**t to the world - I just don't need to do that. Because you get one shot at this.

"I'm not a model. I'm not an ice skater. I'm not a chef. I'm here to do music. And I want to be able to look back and say, 'Yeah, I did it the way I wanted to do it.' Whether it triumphs or fails, I can live with that."

And the 31-year-old singer also revealed how he and his 'Uptown Funk' collaborator Mark Ronson would regularly "fight" over the track and who had the better version.

He added: "I'm not lying when I tell you that we were fighting - I was on tour and Mark would send me something and I'd be like, 'Are you out of your mind?' And I'd send him something back and he'd be like, 'No, my version is better.'"

And Bruno has revealed it was Chris Martin who talked him into performing at the Super Bowl with Coldplay and Beyonce, something which he was initially hesitant to do as he didn't want his appearance to overshadow Coldplay's headline slot.

He told the March issue of WSJ Magazine: "I told Chris, 'This is your Super Bowl performance, you deserve it, go kill 'em.' But he's such a sweetheart and he kept saying, 'Bruno, this is a gift I want to give to everybody.' He talked me into it. He's a sweet talker, that guy. And [Beyoncé] signed up, and all of a sudden I'm in rehearsal dance-battling Beyoncé - what the hell happened?"

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