Lindsay Lohan LLOHANSRONSON042808_08.jpg

LiLo is obvs not ugly, but she WILL be guest starring on ABC's Ugly Betty!

The 21-year-old's first day of shooting was yesterday - Variety reports that Lindsay will appear on the series' season finale, not to mention five episodes of next season as Betty Suarez's old schoolmate. Turns out Linds' character wasn't too nice to Betty in high school, but now Betty is the one with the better life and more promising career...

Hmm, does this sound familiar? Sounds like some pretty ironic casting!