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Mario Lopez & Tiffani Thiessen
Set Where They Met: "Saved by the Bell"
Relationship Status: Split years ago
Repeat Offender(s): Lopez met Ali Landry on the set of the "Miss Teen USA" pageant in 1998 and married in 2004, but she sought an annulment two weeks later over his alleged infidelities. Lopez also had a two-year relationship with his "Dancing With the Stars" pro partner Karina Smirnoff.