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Scots dance star Calvin Harris has been banned from the X Factor studios for life - after leaping on stage during Jedward's performance on Saturday.

Show bosses are furious the Ready For The Weekend star was able to smuggle a pineapple in for the show and then made a mockery of the contest by runnning on stage in front of millions of viewers.

He planted the pineapple on his head to mimick the boys' hairstyles just before storming the set.

Harris ran on stage, grabbed the twins, then slapped his bottom before running off again.

Watch the incident on our player below:

Seconds later, Harris, from Dumfries, was thrown out by security guards.

Last night, an X Factor source revealed: "Simon Cowell did not see the funny side. He thinks Calvin Harris is an idiot.

"Now the bosses have been told to make sure the show is safe for contestants because this could have been some nutter with a knife rather than a silly pop star with a pineapple.

"Calvin was supposed to have been a guest on Xtra Factor but he can forget any thoughts of getting close to the twins or any of the other contestants any time soon.

"Fortunately, most viewers missed his stunt.

"It could have ruined the show and made the voting process a complete farce.

"Calvin will not be appearing on X Factor ever again."

The twins had continued with their song - a version of Queen's Under Pressure - despite the interruption. Judge Louis Walsh later praised them for being so professional.

Writing on Twitter, Harris said: "Was just thrown out of X Factor for jumping onstage during Jedward with a pineapple on my head.

"At the end of the day, I had a pineapple on my head. Sorry if I caused anyone embarrassment. PS I love Jedward."

Earlier, Harris had posted a photograph of a pineapple bearing the legend "important?" on the site.

Despite the distraction, Jedward won over X Factor viewers.

Judge Simon Cowell branded the performance "their best so far.".

Harris's stunt deflected criticism away from Cowell, who had admitted at the start of Saturday night's show that "it has not been my best week".

He had faced thousands of protests after putting the previous week's knockout to the vote, allowing John and Edward to stay at the expense of Lucie Jones.

Cowell had also hit back at criticisms from Sting after The Police star claimed the reality TV show had "put music back decades" and was little more than "televised karaoke".

"I think this show and other shows have given people like Leona Lewis, Alexandra, JLS, Susan Boyle a shot," Cowell said.

"Sting - this is an invite - come on this show and give your knowledge to contestants who need a little bit of your help."

Apart from Jedward, the finalists still in the contest on Saturday night were Stacey Solomon, Olly Murs, Lloyd Daniels, Jamie Archer, Joseph McElderry and Danyl Johnson.

The five acts who have left the show came back last night for a performance of the X Factor charity single.

It is hoped the song, which goes on sale today, will repeat the success of last year's, which raised more than £1million.

This year's cash - from a cover version of Michael Jackson's You Are Not Alone - will go to Great Ormond Street Hospital in London.