Lindsay Lohan's new Utah beau, Riley Giles, has a fiancee! Lindsay met Riley during her 2-month stay in rehab. Lindsay recently announced Riley as her boyfriend and plans to return to Utah after she shoots a movie in Los Angeles to be with him and continue treatment.

Riley's fiancee, Bree Tierney, found out that he was cheating on her through the tabloids.

A friend of Bree's told UsWeekly, "Riley just stopped calling Bree and never told her about Lindsay. She found out by seeing photos. It destroyed her."