Dis-guise in Love with You (1) - S1.E11

Jack's ex is back and he tries to hide all the goodies he's been buying with Sylvia's paycheck (because to Valerie he's still unemployed). They start fighting about her boyfriend and end up sleeping together. The next morning, Jack tries to resume their relationship (in order to save the alimony money), but Valerie finds one of Sylvia's dresses and threats to end it. Jack arranges for her to meet with Sylvia – a very risky move – and Valerie buys it! Unfortunately, the fire alarm goes off at the office, preventing Jack to go back to being a man. When he comes home, Valerie is waiting for him with a very sexy negligee. She certainly wasn't expecting to see Sylvia there, so Jack reveals her the truth in order to spare their relationship.