POP group Wet Wet Wet's squeaky clean image was washed up yesterday after lead singer Marti Pelow exploded at a press conference. The Scottish singer, in town for the band's concert last night at the Queen Elizabeth Stadium, lost his temper and lashed out after being questioned by Catherine Barnes, host of Piranha Bob's Celebrity Fishtank, a youth show on RTHK Radio 3. Celebrities from around the world are asked who they would most like to throw in a piranha-filled fishtank. Stars from Boy George to Roger Moore have supplied victims. Pelow said his choice was his brother because they had just had a row and were not speaking. When asked what the argument was about the singer, who had a smash hit last year with Love is All Around from the soundtrack of Four Weddings and A Funeral, yelled: 'None of your f***ing business.' He went on to tell the stunned room he did not 'really care what people say because we sell millions'. 'The people here in Hong Kong have been lovely to them and there was no need for that,' Ms Barnes said. 'They knew I was from a children's show and he knew we were taping him.' Earlier this year Boy George said his choice to toss in the fishtank was Marti Pelow.