Sister of the Groom is a 2020 American comedy film, written and directed by Amy Miller Gross.

It stars Alicia Silverstone, Tom Everett Scott, Jake Hoffman, Mathilde Ollivier, Charlie Bewley, Noah Silver, Abigail Marlowe, Mark Blum, Julie Engelbrecht and Ronald Guttman.

Audrey (Alicia Silverstone) rides to the Hamptons with her husband Ethan for her brother Liam's wedding with Clemence, a young French woman (Mathilde Ollivier), rescheduled to the same weekend she turns 40.

Minutes before they arrive, Ethan spills Audrey's coffee over her, and she is not given the chance to change for the casual chic opening Shabbat dinner.

So she is introduced to the French family at a Shabbat dinner, where she is upset to discover Liam is going to do massive changes to the house using an architect other than herself, her ex-boyfriend Isaac.

At the reception, Isaac makes a pass at her right after Ethan storms off in a jealous huff, probably due to his micro-dosing.

In November 2018, it was announced Alicia Silverstone, Tom Everett Scott, Jake Hoffman, Mathilde Ollivier, Charlie Bewley, Noah Silver, Abigail Marlowe, Mark Blum, Julie Engelbrecht and Ronald Guttman had joined the cast of the film, with Amy Miller Gross directing from a screenplay she wrote, with Silverstone serving as an executive producer.