The trade paper Variety reports the 21-year-old Lohan is set to play an old schoolmate of America Ferrera's character Betty Suarez on the show's May 22nd season closer. Both Variety and Usmagazine.com say Lohan began shooting her scenes this weekend. Lohan also is expected to appear in five episodes of "Ugly Betty" next season. Her publicist did not immediately return a call seeking comment.