First Pics of Lindsay on Ugly Betty!

We've all heard the buzz about Lindsay Lohan's debut on the hit ABC series Ugly Betty, and now there are pics to prove it!

Check out Lindsay hamming it up in her first guest spot the show, where it looks like she's making poor Betty's (America Ferrera) life more stressful than it needs to be!

In the show's season finale, set to air May 22, Lindsay plays a "mean girl" who re-surfaces in Betty's life and makes her life hell. For all of you L.L. fans, the actress will also appear in five more episodes when the show premieres its third season next fall.

Check out more pics of Linds from the set of Ugly Betty below!

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(Courtesy ABC)