Sir Elton has accused Janet Jackson of lip-syncing during her world tour.

Elton John has told fellow pop star Janet Jackson to “fuck off” – before accusing her of lip-syncing during her live shows.

During a recent interview with Rolling Stone, the outspoken veteran expressed his confusion as to why her concerts receive so much praise from the media.

“You know, fucking music magazines writing a review of Janet Jackson saying, ‘This is the greatest show – four and a half stars.’

“It’s fucking lip-synced! Hello! That’s not a show! I’d rather go and see a drag queen. Fuck off,” he said.

This isn’t the first time the singer has lashed out at a fellow musician.

Sir Elton – who’s currently promoting his latest album Wonderful Crazy Night – made similar accusations about Madonna back in 2003, something which he later apologised for.

“I say what I feel. I probably went too far with Madonna, and I got very personal and I wrote to her – she was very gracious.”

John also recently revealed a 40-year feud with late superstar David Bowie.

The Rocket Man singer said the pair had become friends early on, but that they had “drifter apart”.

Noting apparent comments by Bowie that he was “rock’n’roll’s token queen”, Sir Elton said he thought Bowie was “a bit snooty”.

“David and I were not the best of friends towards the end,” he said.

“We started out being really good friends. We used to hang out together with Marc Bolan, going to gay clubs, but I think we just drifted apart.

“He once called me ‘rock’n’roll’s token queen’ in an interview with Rolling Stone, which I thought was a bit snooty.”

However, despite their apparent falling out, Sir Elton commended Bowie for the “dignified” way he handled his death.