The actress rocked a bold red lip and had her hair pulled back into a half-up half-down hair style while she accessorized with a black clutch.
Chrissy, who is 1/3 of the "big three" on This Is Us and plays Kate, wore a princess style black gown. The dress had a chiffon polka dot overlay and a sweetheart neckline. She completed her look with a matching black clutch and black sandals.
Susan Kelechi Watson, who plays Randall's wife on the show, wore a bright yellow number last night. The layered dress had stripped detailing and showed off the actresses long legs. She completed her look with a matching yellow clutch and silver heels.
Mandy was also photographed with Chris Sullivan at the party, who plays Tobi, Kate's husband on the NBC series.
Which outfit from the event is your favorite? Let us know in the comments!