Robert Pattinson shocked viewers as he dropped the F-word live on TV

The Twilight Saga actor seemed at pains to show his edgier side as he took to the stage various times to pick up awards and introduce segments at the MTV Movie Awards.

Having already won Best Actor and Best Actress awards, Pattinson and co-star Kristen Stewart got on stage to accept the Best Kiss gong.

As the audience shouted for them to kiss on stage, Pattinson said there was someone else who would 'appreciate' it a little more.

To gasps and laughter, he walked over to co-star Taylor Lautner in the audience and pretended to passionately make-out.

Things then got even edgier as Pattinson got on stage to pay tribute to Reece Witherspoon as she was about to pick up the Generation Award.

Looking very uncomfortable, despite the use of notes, he told how his very first film Vanity Fair was also with Witherspoon – who played his mother.

Speaking to the actress, he said: 'What I later learned though is you were directly responsible for cutting my part of the movie out.'

Referring to their romantic pairing on Water for Elephants he then added, to gasps from Witherspoon and the audience: 'This time you played my lover. I didn't cut it out but I did f*** you.'

He then said it is not a bad thing to have 'sexual chemistry' with your mother.

Various swear words throughout the broadcast, which had a slight time-delay, were muted out – but his made it through.