Mamma Mia indeed! On Thursday night Meryl Streep's three daughters Grace (23), Mamie (25), and Louisa (17) glammed it up publicly for the first time together at the CHANEL and Tribeca Film Festival Artists' Dinner at Odeon in New York City.

The sisters Gummer all wore frocks by the French fashion house and matching Louboutin peep-toe pumps. Could this be the start of a new Streep dynasty? Without a doubt!