PA
Jedward, Louis Walsh and Westlife's Mark Feehily are just some of the celebrities taking part in the campaign, which was actually organised by Mark, who was bullied as a child.
'I know at first hand how the impact of being bullied as a teenager can quite literally last a lifetime,' said the singer.
'I thought that if we could involve well-known ISPCC ambassadors perhaps people will think twice about bullying or indeed allowing bullying to happen.'
The campaign comes as the ISPCC announced it received around 2,300 calls a day from young people, with a quarter of these relating to abuse and bullying.
Have a look at the stars and their bruises in our gallery below...