Singer-songwriter Bruno Mars has admitted that his forthcoming new single, 'When I Was Your Man', makes him feel "vulnerable" and "naked".

He recently debuted the official music video for the track and explained to MTV News that it's a very personal song, but deals with universal themes that all kinds of people can relate to:

"You know it's one of those things where even girls can relate to this song. That's how it works. Everyone makes mistakes. And I remember writing that and it's the simple things, the little things. Like, I should have bought you flowers; I should have just let you know when I had the chance."

He also admitted that singing about such intimate subjects make him feel as though he's baring his soul, which in turn leaves him feeling exposed:

"And that was probably the most difficult song to write just because you know I'm so naked on that song, out of all the sexual songs I'm singing about, that's the one I'm most vulnerable. And I think a piano and a vocal is the most purest form of music."

Watch his video for 'When I Was Your Man' here: