Betsy (best known for her role as Marie Schrader on the AMC drama) takes part in a sketch with host (and Community leading man) Joel McHale on tonight's show. I'd say more, but I've been sworn to secrecy. I have it on good authority that it's hilarious.
Here's a pic of Betsy on the set. In case you missed it, you can also read my interview with her about this season of Breaking Bad, which airs its season finale this Sunday at 10 PM ET/PT on AMC.