Cheated on: David Duchovny
Secret lover(s): Billy Bob Thornton

Ma$e said it best: "You can't think you gonna be cheatin' and the girl ain't gonna cheat." Even after nympho David Duchovny admitted to being unfaithful for several years and checked himself into sex rehab, scorned wife Téa Leoni sought revenge. And she found the perfect guy to soil her sheets—her Manure co-star Billy Bob Thornton. Once completing rehab, Duchovny came back home and took a peak at Leoni's cell phone, where he stumbled upon a few X-files in the form of dirty texts sent by Thornton.