Watch Gossip Girl: Season 4, Episode 21

"Shattered Bass"

Just as Charlie is finally starting to fit in with Serena and her friends, things become complicated for her when she is invited to attend a Constance Billard alumni fundraiser. Meanwhile, Blair begins to find herself torn between the men in her life. Jack Bass returns to the Upper East Side and yet again wreaks havoc in ways that could end up being devastating for Chuck.

Title comes from the 2003 film Shattered Glass.