The 29-year-old former Glee actress was seen holding hands with her boyfriend, Mumford & Sons banjoist Winston Marshall, while leaving the show.
Also in attendance was actress Imogen Poots.
Dianna opened up to the New York Post at the show to reveal her fashion advice. “Don’t think too hard, and don’t listen to the rules. I’m eclectic and quirky, and like switching from being superfeminine to dressing masculine,” she said.
FYI: Dianna is wearing Rona Pfeiffer Jewelry earrings. Imogen is wearing Brian Atwood shoes.