Jacob Tremblay was absolutely adorable at the Oscars and it's no wonder, the 9-year-old breakout star was the secret weapon in Room.
In the Oscar-nominated movie, Tremblay perfectly embodies Jack, a 5-year-old boy who lives with his mother Joy (Oscar winner Brie Larson), in a squalid shed they call "Room" before he triumphantly escapes.
"We spent a long time looking for our Jack and Jacob Tremblay stood out from early taped readings that I got sent," director Lenny Abrahamson said in ET's exclusive look behind the casting of the young actor, available on the DVD/Blu-ray set, out Tuesday. "Jake is very unique, I think, and really quite amazing."
"We've been extremely lucky with Jacob. He's 8 years old playing 5, but he's also an experienced actor -- he's done this before so he's not coming to it for the first time," raved producer Ed Guiney, as we catch a glimpse of young Tremblay in character on set.
"He's incredibly bright and [has] great concentration, but he's still a kid, he's still a boy and full of life and full of fun and mischief," Guiney added.
Larson, who thanked her "partner" Tremblay during her Oscar acceptance speech on Sunday, revealed the three questions he asked her in their first meeting.
"What's your favorite color? What's your favorite animal? And do you like Star Wars?" Larson shared. "And that was the beginning of it."
Tremblay, for his part, credited Larson for helping him get into the right mindset for specific scenes.
"When I need to be serious, she helps me be serious," the actor adorably explained.
"I was sitting at the Golden Globes and my phone started going crazy," Jacob's dad, a police detective in Vancouver, told ET on the red carpet. "I checked it on commercial break and it was family, friends and a lot of co-workers from work giving me a hard time. But it's all in fun."
"It's not a bad thing to be called!" he added. Press play on the video below to watch the rest of the ET interview.