Katie Leclerc and Vanessa Marano share a laugh as they speak on stage during Disney/ABC Television Group’s portion of the 2012 Winter TCA Tour held at The Langham Huntington Hotel on Monday morning (January 9) in Pasadena, Calif.

The on-screen “sisters” were joined by cast mates Sean Berdy, Lucas Grabeel, Constance Marie, Lea Thompson and D.W. Moffatt.

Vanessa admitted during the panel that Lucas picked up ASL quicker than anyone else.

“Katie actually taught me when we first started. I went to her, and she taught me five signs every day. So because I really fell in love with the language immediately and just wanted to learn as much as I could” Lucas added.

But Vanessa isn’t bad herself either, according to Sean. “When we sign, I can completely understand her,” he signed.

FYI: Katie is wearing a dress by Ted Baker with Steve Madden shoes. Vanessa is in an AllSaints dress and YSL heels.

Switched at Birth airs TOMORROW, January 10th @ 8PM ET/PT on ABC Family. 30+ pics inside…