In 2009, he got through and sang Stevie Wonder’s Superstition in his audition, which wowed the judges – Simon Cowell, Dannii Minogue, Louis Walsh and Cheryl Cole.
He progressed to the final during which he duetted with his idol Robbie Williams – who fluffed his lines as he came on stage but recovered with Olly’s help.
He also had eight top ten singles, four of which were number one.
Olly has also turned his hand to presenting, which was kick-started when he sat in for Comedy Dave Vitty on the Chris Moyles Show on Radio 1 for a week.
He was born Oliver Stanley Murs, 33, on May 14 1984 in Witham, Essex, to Vicky-Lynn and Pete Murs.
He has a twin brother named Ben and a sister called Fay.
He takes a seat alongside returning experts Sir Tom Jones, Jennifer Hudson and will.
The series, hosted again by Emma Willis, kicked off on January 6 and continues every Saturday on ITV.Olly has previously admitted that his decision to become a judge on a rival talent show has upset his former boss Simon.In October, Olly confessed it had been radio silence from team Simon since gaining his new job. I don't believe in rivalries." In late December, speaking to the TV Times, the Heart Skips a Beat hitmaker said Cowell still hasn't been in touch. "I’m so proud of what I did on my X Factor journey from the early days up to now." However, Olly is adamant that if Simon did pick up the phone, he'd be willing to chat.Olly famously fell out with his twin Ben when his brother’s wedding clashed with him taking part in the X Factor semi-final.In 2008, after Olly spent three months backpacking along the east coast of Australia, he decided to audition again for the X Factor, having tried two before but failing to make it to audition stage.But they have enjoyed a string of hush-hush dates at each other’s houses after bonding over their mutual love of keeping fit.