Bernadette Peters took to the set of "Ugly Betty" and ET was there for this unforgettable episode.

Bernadette tells ET about the excitement she felt when she found out she was going to appear on the show.

"I very wonderfully got this call and this script to come and play with us on 'Ugly Betty' and I thought this is great," she says. "It's a wonderful show."

Watch the video to get inside looks into the show with interviews from Bernadette, Vanessa Williams and "Ugly Betty" herself, America Ferrera.

Bernadette plays one of Betty's idols that she admires in the publishing world.

Catch the show Thursday nights on ABC.