Ed Sheeran regrets grabbing Chris Martin's backside at the iHeartRadio Music Awards on Sunday (05.03.17).

Ed Sheeran

Ed Sheeran

The 26-year-old singer has admitted he gave the Coldplay frontman's rear a cheeky squeeze before he took to the stage at the award ceremony over the weekend, but has said he was left perplexed by his own actions just moments after the intimate connection was made.

When asked what the funniest moment of his night was, Ed said: "I saw Chris Martin about to go onstage and I walked up behind him and squeezed his a*s. And then I was like, 'Why did I do that?' Sometimes you gotta do it, but ... yeah. Do you know what? I do it to my mates. I don't know."

And despite being confident that Chris, 40, didn't mind Ed's gesture, the 'Castle on the Hill' hitmaker still believes he "probably shouldn't" have done it.

He added to E! News: "I don't think we're that close. I've known him for a bit and I think we get on. There was definitely a moment where I was like, 'I probably shouldn't have done that.'"

The 'Hymn For The Weekend' hitmaker isn't the only famous friend Ed has found himself getting close to either, as he recently admitted to having previously hooked up with some of the members of his pal Taylor Swift's squad - which includes star babes such as Lorde, Selena Gomez, Lena Dunham, Martha Hunt, Kendall Jenner, Karlie Kloss, Hailee Steinfeld, Gigi Hadid and Cara Delevingne - whilst on tour in 2013.

He said: "Taylor's world is celebrity. I was this 22-year-old awkward British kid going on tour with the biggest artist in America, who has all these famous mates. It was very easy ... I would often find myself in situations just kind of waking up and looking over and being like, 'How the f**k did that happen?'"