Yesterday was a big day for celebrity sightings on the set of “Ugly Betty.” Not only was Adriana Lima on the scene for her big acting debut, but Lindsay Lohan was continuing her guest role on the hit comedy series.

The “Mean Girls” hottie looked sexy as she filmed scenes with America Ferrera, sporting a floral top teamed with a navy skirt, fishnet stockings, and some funky laced-up heels.

As for her personal life, LiLo recently told press that while she’s found happiness with girlfriend Samantha Ronson, her new lease on life has come by making it through her hard trials.

"I'm really happy. She's a great person. And she's a great influence on people around her. But I think that anything that's changed [in] my life is because of me. I've gone through it, and I've learned to deal with it and I've made the decision to move forward."

Gossip Girls

Enjoy the pictures of Lindsay Lohan (and America Ferrera) on the set of "Ugly Betty" (September 9).