X Factor svengali Simon Cowell has pledged his support for Louis Walsh following allegations he indecently assaulted a 24-year-old man.
It has been reported that police were called in after the alleged assault in a nightclub toilet in Dublin, but they have not interviewed Walsh about the claims.
Cowell told The Sun: "I have known Louis Walsh for 20 years and I don't believe for a second that these allegations are true."
He told the Sun: "Like all of his close friends I will support him 100 per cent."
A spokeswoman for 58-year-old X Factor judge Walsh said: "He vigorously denies all of the allegations.
"If contacted by the police he will willingly co-operate with any investigation. Louis categorically denies any wrongdoing and will fight to clear his name."
She added: "The fact of the matter is the police have made no contact with Louis whatsoever."