Season 3: Episode 45: Cocktails
MAKING IT OFFICIAL-- Michael (Golden Globe winner Steve Carell) and Jan (Melora Hardin) go public with their relationship during a party at their CFO's home. At the party, Jim (John Krasinski) meets Karen's (Rashida Jones) ex. Meanwhile, the rest of the office decides to go to happy hour for drinks. Rainn Wilson, Jenna Fischer, B.J. Novak, David Denman, Leslie David Baker, Brian Baumgartner, Kate Flannery, Angela Kinsey, Oscar Nunez, Paul Lieberstein and Mindy Kaling also star.