Gary Barlow is being joined by celebrity friends today as he heads off on a charity drive from Land's End to John O'Groats.
With a campaign looking into online bullying being launched, we look at five celebrities who have been the victims of web trolls.
X Factor's Ella Henderson stole the show tonight with a simple and slowed down version of the Grease classic The One That I Want.
X Factor judges Gary Barlow and Tulisa Contostavlos were locked in peace talks on Saturday night after he accused the N-Dubz star of having "fag-ash breath" in front of millions of viewers.
Barlow has said sorry for the comment he made on Saturday night's ITV1 programme as show insiders revealed the pair spent time alone in a dressing room discussing their spat after filming ended.
A show source said: "They were locked in a dressing room for peace talks after the show; just the two of them. Gary apologised a lot. Tulisa was angry but eventually she accepted his apology.
"Gary feels really, really bad about what he said. It was speaking without thinking in the spur of the moment and he didn't mean it."
Gary Barlow said he and the other performers feared the summer's Diamond Jubilee Concert would be cancelled on the day amid heavy rain and the Duke of Edinburgh's health scare.
Gary Barlow has said he has no plans to return his OBE following calls for him to return the honour in the wake of claims he used an "aggressive tax avoidance" scheme.
Asked if he will hand it back, he said: "I'm very proud to have it. Very proud."
The Take That star and X-Factor judge is attending a reception at Buckingham Palace tonight hosted by the Queen to thank those involved in the Diamond Jubilee celebrations.
Gary Barlow is planning his first solo tour for 13 years with a string of dates beginning next month.
The Take That star has announced 16 shows, which he will fit around his X Factor commitments.
Gary said: "Playing live is my favourite thing. Last year playing two London shows was brilliant - we all had such a good time - so I thought right let's get out and see the rest of the country."
The tour will begin at the Bournemouth International Centre on November 13.
The shows - which include performances at the Manchester Apollo and the city's Bridgewater Hall - will wind up at The Waterfront in Belfast on January 8. Tickets go on sale on Friday. Visit www.garybarlow.com for more details.
Cheryl Cole - who was given her big break on TV talent show Popstars: The Rivals - will tell the X Factor hopefuls she can sympathise because she has been in their position.
The Girls Aloud star says: "I've been there and I have been here so I know how you are all feeling, I am just excited to see what you have got. [I] think it's going to be amazing and I wish you the best of luck from the bottom of my heart."
Other guest mentors include Tinie Tempah, who teams up with Tulisa Contostavlos, Ne-Yo who accompanies Nicole Scherzinger and Sharon Osbourne who is the sidekick to Louis Walsh.
Former X Factor judge Cheryl Cole will be back on the show tonight, almost two years after her departure.
Cole will return as a guest mentor, helping Gary Barlow put his acts from the older "overs" category through their paces during the judges' houses stage of the ITV1 talent show.
She bowed out from the UK X Factor after the 2010 series to take up a short-lived place on the panel for the US version of the show.