Last night's NYC premiere of Night at the Museum: Secret of the Tomb was a star-studded event. But one star in particular was noticeably absent from the evening's festivities: Robin Williams.

The late actor's wife, Susan Schneider, 50, attended the Thursday, Dec. 11 event in his honor and spent time with the actors who worked with her husband on one of his last completed films.

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Susan at the 'Night at the Museum' premiere in NYC.

While costars shared fond memories of working with the comedian, the film's star, Ben Stiller, 49, reflected on Robin's "huge part [in the] 'Night at the Museum' movies."

"I remember when the first movie happened and Shawn [Levy, the director] said he wanted to ask Robin to play Teddy Roosevelt and I was like, 'Oh my God, that's the most brilliant idea in the world,'" Ben said in a red carpet interview.

Ben also noted that had Robin — who passed away at age 63 from suicide in August — been present at the premiere, "he'd be making everyone laugh a lot more than I am."

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Robin (as Teddy Roosevelt) alongside Ben Stiller in the film.

Skyler Gisondo, 18 — who portrayed Ben Stiller's character's son in the film — similarly shared his own kind words about filming with Robin.

"He was one of the kindest, most humble, funniest guys you could have the privilege of knowing, and I feel so lucky to be able to work with him when I did," he told 'People.' "We all miss him. Very much."