Season Two, Episode 23. Kaley Cuoco is quite braless, and apparently chilly, when Leonard wakes her up in the middle of the night. These types of scenes will have to do until Kaley wises up and strips down.
Season Three, Episode 12. Leonard reconsiders his relationship with Penny when he learns that she believes in psychics. Penny (Kaley Cuoco) reconsiders her relationship with Leonard after he mocks her belief in psychics. One of the two is going to have to compromise their steadfast belief if their relationship is to continue. No, Kaley's not naked on network TV, but she does go braless and pokey in this scene.