Louis Tomlinson cheekily swore at an 'X Factor' contestant after he was mistaken for Olly Murs.

Louis Tomlinson

Louis Tomlinson

The One Direction star joined the talent show as a judge for the upcoming new series, and jokingly stuck two middle fingers up at a hopeful singer who mistook him for the 'Dance With Me Tonight' hitmaker after getting a standing ovation following their audition.

An insider told The Sun's Bizarre TV column: "Louis has really taken to his new judging role on the X Factor and has been surprised by the amount of talent on this year's show.

"One of the contestants he was really impressed with was one guy who came onstage, confessed his undying love for Robbie and then did a duet of 'Angels' with Robbie.

"But Louis was less than impressed after the audition when the contestant thanked all the judges for giving him a standing ovation - but called him Olly!"

While the audience at the SSE Arena in Wembley found the awkward moment hilarious, Louis, 26, was quick to make his feelings known.

The source added: "The audience were in hysterics as Louis straight away gave him two middle fingers and shook his head - it wasn't the best way to finish an audition but it'll make great telly."

The singer is part of a new-look panel for the upcoming series, which also features Robbie Williams, 44, and his wife Ayda Field, 39, alongside returning boss Simon Cowell, 58.

Louis recently reassured his fans that music is his "priority", despite joining the judging panel.

He said: "I just wanted to thank everyone for the support so far and I want everyone to not worry too much about the album.

"It's still definitely my priority. It doesn't change any release time. I came from the show so it made a lot of sense for me to go on."