Cheryl Cole is planning to conduct a lie detector test on husband Ashley Cole who is reportedly cheating on her.

"At least by doing a lie detector test, Cheryl will know one way or another whether what Ashley tells her is true or just a pack of lies. And if he is lying, I expect their marriage will be history," said a friend.

Wired up to the machine that measures signs like pulse rates and breathing rhythms, the Chelsea star would be asked a string of questions over his alleged infidelity, reports dailystar.co.uk.