Catherine O'Hara Wins Posthumous Actors Award, Receives Standing Ovation

Catherine O'Hara's acting colleagues have honored her with one last trophy ... awarding her a posthumous Actors Award.

The actress was nominated for Outstanding Performance by a Female Actor in a Comedy Series for her part as Patty Leigh in "The Studio" ... and, she won it at Sunday night's ceremony.

When her name was announced, the audience jumped to its feet in rapturous applause ... and, Seth Rogen -- who won his own Actors Award for "The Studio" -- headed to the stage to accept the trophy on O'Hara's behalf.

Rogen said O'Hara would've been honored to receive the award ... before telling a hilarious anecdoate about how O'Hara would always send notes on the script before shooting -- and always improved it.

We broke the story ... O'Hara passed away in January from a pulmonary embolism -- though she also had rectal cancer at the time

Many of O'Hara's famous friends paid tribute to her on social media ... while Martin Short and Steve Martin shared their love for the star during one of their comedy shows.

According to reports ... O'Hara did not film any scenes for season 2 of The Studio -- so her Actors Award-winning performance is likely the last of her career.

Catherine was 71.

RIP