U2 rocker Bono's wife is confident her spouse is no cheat - but is realistic about the temptations he faces as a famous musician.

Svelte mother-of-four ALI HEWSON admits "there was a lot of stuff going on" when her husband's band first shot to fame at the dawn of the 1980s.

But the 44-year old insists she would rather not know the details of his rock 'n' roll lifestyle, or how many groupies swarm round him.

She says, "Hopefully I'll never know. I don't think it was that kind of rock 'n' roll. Then again, I wasn't there."