Oscars 2016: Inside Jacob Tremblay's Big Oscar Night

— -- Hollywood's biggest stars attended Sunday night's Oscars but it was a 9-year-old actor who stole the show.

"Room" star Jacob Tremblay stood on top of a box on the stage at the Dolby Theatre to present an award alongside fellow child actor, Abraham Attah.

"I'm presenting Best Live Action Short because I'm short," Tremblay joked to "Good Morning America"'s Amy Robach before the show.

"It feels pretty cool," Tremblay said of all the attention he's received this awards season.

Tremblay starred in "Room" with Brie Larson, who went on to win this year's Best Actress Oscar. Larson, 26, gave Tremblay a high-five during the awards and a shout-out in her acceptance speech.

"Jacob Tremblay, my partner through this in every way possible," Larson said.

Tremblay, who shared his Oscar experience with his fans on Instagram, had a fan-boy moment himself when C-3PO, R2-D2 and BB-8 came on stage to present an award.

Tremblay, who accessorized his black-tie with Millenium Falcon cufflinks and Darth Vader socks, shared a snap of himself with the "Star Wars" characters, captioning the photo, "My new squad!"