Plot summary
The annual Snowflake Ball has arrived for the students of St. Jude and Constance Billard. Blair and Chuck decide to test how well they know each other, which ends with them finding doppelgängers of themselves. Aaron's ex-girlfriend, Lexi, expresses an interest in Dan. There is drama between Serena and Dan about their sex lives. Nate, Jenny and Vanessa get into a tangled situation that puts their friendships and hearts on the line, as Vanessa steals a love letter Nate had written to Jenny and continues her relationship with Nate. Jenny retaliates by sending an unsuspecting Vanessa to the ball in a see-through dress. After the ball, Nate ends things with Jenny and goes after Vanessa. As Bart Bass is trying to return to the Snowflake Ball, he suffers a car accident. Title reference: The 1946 film It's a Wonderful Life.
Credits
Adapted from Wikipedia contributors, Gossip Girl season 2. HTML formatting and reference markers removed.