S6, E3: Feeling the pressure to make her first Waldorf Designs fashion show a success, Blair must rely on help from an unlikely source, but some unexpected scheming causes a scandal on the runway. Serena discovers that befriending Steven's (recurring guest star BARRY WATSON) daughter, Sage (recurring guest star SOFIA BLACK-D'ELIA), is trickier than she thought, especially when she is forced to put her issues with Blair aside to make Sage happy. Nate publishes Dan's first serialized article, causing a stir and producing a serious threat. Meanwhile, Chuck begins to look into the clue that Amira (recurring guest star ANDREA GABRIEL) left behind, which may help uncover what Bart (recurring guest star ROBERT JOHN BURKE) is hiding. Plus, style icon ALEXA CHUNG makes an appearance.