Liberty X star Michelle Heaton and her Pop Idol boyfriend Andy Scott-Lee were spotted arguing loudly on a London street recently.

“Michelle and Andy were walking in Soho, looking all lovey-dovey,” a source explained to The Mirror.

“But then something was said and Michelle began shouting at Andy, saying, ‘I can’t believe you could do this!’ and he was raising his voice, too.”

“She started walking off ahead of him. Obviously a nerve had been hit.”