Simon Cowell has defended the established acts appearing on Britain's Got Talent, saying "everyone deserves a second chance".
There had been some accusations about the current series of the ITV show, as some of the contestants were previously on other shows such as impressionist Francine Lewis - who was a cast member on Channel 4's sketch show Very Important People - and singer Alice Fredenham, who unsuccessfully auditioned for this year's The Voice UK before trying out for BGT.
The TV mogul, who created and is a judge on the show, tweeted: "We have had some stick regarding so called established stars appearing on BGT this year. We try and have a no rules policy on the show. Everyone who auditions is either looking for a break or a second chance.
"Would it be right to say to someone who has appeared on a show before you can't audition? The reason we always let the public vote is they can decide who they want to win."
The 53-year-old, who sits on the judging panel alongside Alesha Dixon, Amanda Holden and David Walliams, insisted there is "no hush hush plot".
"I am not whining. Simply wanted to explain there is no hush hush plot. I just think everyone deserves a second chance," he said.
Simon added: "I believe Susan Boyle had appeared on another TV show years ago. Nothing happened. BGT gave her another go. Is that wrong?"
Britain's Got Talent continued to dominate the ratings battle over its BBC rival The Voice this weekend, peaking with 9.73m on Saturday night (April 27) on ITV.