Lindsay Lohan stole new boyfriend snowboarder Riley Giles from his fiancée
- according to the girl's mother.
The 21-year-old actress confirmed reports she is dating the
California-based X-Games star earlier this month (Oct07), after leaving
the Cirque Clinic rehab facility in Utah.
But Giles was already engaged to Utah resident Bree Tierney - and news
of his relationship with the Mean Girls star has left her heartbroken.
Tierney's mother, Tess, says, "Riley just stopped calling Bree and
never told her about Lindsay.
"She found out by seeing photos. It destroyed her."