Lindsay Lohan has officially started her guest spot on Ugly Betty. Apparently the party girl showed up for her first day of work on Saturday, and not only did she arrive on set early, but sources say she actually did a good job!

Lindsay's playing an old high school friend of Betty's and will be appearing for five episodes. Think it'll go more of the Mean Girls route or do you think Lindsay's character may have actually been really nice to Betty?

I wonder if all of the problem celebs will follow this new trend. First Britney went on How I Met Your Mother and the world watched in shock as she actually seemed... normal. Maybe Betty will change our opinion of La Lohan?