It looks like Lindsay Lohan is getting ugly: The star will appear in the season finale of Ugly Betty, a rep for ABC confirms to PEOPLE. "The deal became official early yesterday morning," she adds.
An on-set source says Lohan filmed her scene -- a flashback in which she plays America Ferrera's high school friend -- yesterday. "Lindsay was on time and actually arrived to set early," says the source. "She did a good job."
The source also adds Lohan will also appear in five episodes of season three. --Beth Perry and Abby Stern