Rat detector

KERRY KATONA has warned her husband she will divorce him if a lie detector test shows he really HAS been cheating on her.

The former Atomic Kitten star will this week make Mark Croft take a polygraph test after allegations he had affairs with two women.

She has told him their 13-month marriage is OVER if he fails or refuses to take it.

A source close to the couple confirmed: "If Mark's not telling the truth, he's out."

The crunch came last week after she apparently found a text on his mobile from a mystery woman saying I Love You. She was so upset she checked into The Priory for three days.

The couple are currently starring in fly-on-the-wall TV series Crazy In Love. But Kerry has no intention of letting makers MTV film the test-indicating her bid to discover the truth about Croft's flings is no stunt.

Last August she kicked him out of their Cheshire home when his ex Clare Bonello, 24, claimed she romped with him days after he proposed to Kerry.

Trust

This month pretty Samantha Riaz, 29, said she and ex-cabbie Croft, 37, had sex in a hotel last summer, just weeks after he married Kerry.

Both women said Croft told them he only married the Iceland TV ads star for her money.

Our source added: "Mark has told Kerry the women are lying but she doesn't trust him. She has told him if he doesn't take the test it is over between them and if it proves he is a liar she will divorce him...and probably rip his head off.

"Mark is desperate to stay with her for the sake of the kids and the lifestyle and has agreed to it."

The couple have a daughter Heidi, 13 months, while the busty 27-year-old is expecting their second child in May. She also has two children by first husband Brian McFadden.

The lie test, widely used in the US but not recognised by British law, will monitor Croft's blood pressure, heart rate and sweating as he answers a range of questions.