Heather Mills cheated on Sir Paul McCartney for six months with a secret lover, it has been revealed.

The former model had marathon sex sessions with film editor Tim Steel the night before joining the Beatles legend on a romantic Caribbean Valentine’s holiday.

The sensational revelation comes as the couple prepare for a confrontation week in their bitter multi-million-pound divorce battle.

Steel has claimed that the former porn star had showed him Sir Paul’s loving texts, before romping with him.

“I didn’t mind-I suppose I was flattered that Heather still wanted to have sex with me despite being pursued by this musical demi-god,” News of the World quoted Steel, as saying.

“Heather was insatiable between the sheets and she liked to call me her four-times-a-night guy. Our record was six.

“But it was strange lying in bed talking about Paul McCartney. I would be with her when he called or texted her. She’d even show me the texts!” he added.

WENN