LOS ANGELES —  Lindsay Lohan will make a guest appearance on the season finale of ABC's "Ugly Betty."

The 21-year-old actress is set to play an old schoolmate of America Ferrera's character Betty Suarez on the show's May 22 season closer, according to the trade paper Variety.

Both Variety and Usmagazine.com said Lohan began shooting her scenes during the 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 Sunday.