Bruno Mars brands Adele a 'diva' after collaboration

Bruno Mars has labeled collaborator Adele a "diva with attitude".

The pair teamed up on song All I Ask for Adele's most recent album 25. While the tune was a hit with fans, Bruno opened up about the challenging recording process during an interview on WTKU radio show Cubby and Carolina in the Morning on Tuesday (25Oct16).

"She walks into the studio, she's got all this attitude, she's a diva, she's like, 'I don't want to do this. I don't like that,'" Bruno shared. "And then as soon as we hit a couple chords that she liked, we started rolling, and that's where we got that song from."

Bruno was quick to clarify his comments, insisting that working with the 28-year-old singer was a once in a lifetime opportunity.

"She was singing in the booth and I'm not exaggerating at all, and the water was vibrating - like that scene in Jurassic Park," he gushed. "She's got some pipes on her, and she's just a superstar."

As well as being a successful singer in his own right, Bruno has written a huge amount of songs for his peers - including CeeLo Green's Forget You and Justin Bieber's Love Me.

He may have joined forces with some of the music industry's biggest names but there are still some stars he would like to team up with in the future.

"I haven't done a song with Beyonce," he mused, before revealing Rihanna and Britney Spears as dream duet partners, adding: "Anyone who wants to work, come on down!"

One of the first times Adele performed All I Ask was during a taped concert in New York in December (15). However, she struggled to sing the track to her usual standard, telling the audience the recent surgery on her vocal cords had altered her vocal range.

"It is... it's really hard to sing. I had vocal surgery and then suddenly I could sing higher, I could sing lower, I could do whatever you wanted me to do," she said. "As soon as I'm in front of you lot, I just (mess up) myself."