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Brie Larson, Golden Globe After Party

Kevin Winter/Getty Images

Brie Larson had a simple, but very real initial reaction when she heard her named being announced for an Oscar nomination for work in Room.

"I thought, 'Holy s--t!'" she said, adding, "It's that mixed with a total flat line."

She actually had just gotten home from a long day of work filming Kong: Skull Island in Australia.

"It was a very physical day, a lot of climbing. I just climbed mountains all day today in the hot Australian sun so I was just exhausted," said Larson, 26. "So I was tired so I thought this is the perfect way to do it while your body is just really exhausted and you're kind of relaxed about it.

"I didn't realize how strong my reaction would be," she continued. "My whole body was shaking. I started crying. It really was when they gave [Lenny Abrahamson] a best director nomination that I really lost it. He's so deserving of it. So well deserved and so exciting to see."

Brie Larson, Golden Globe Awards, Winner

Paul Drinkwater/NBCUniversal via Getty Images

Room follows the journey of a young woman (Larson) who has been held captive in a shed for several years with her five-year-old son (Jacob Tremblay).

Larson's Kong co-stars, which include Samuel L. Jackson and Tom Hiddleston, were ready to help her celebrate as soon as the noms were announced. "I'm on a giant text chain with all the actors from the movie," she said. "There are like 14 of us on it and they all just flooded my phone and they said they were going to bang down my door with champagne. But it's 12:15 a.m. and I have to get up for work in the morning so it just doesn't seem reasonable to me. We'll do champagne another day."

Lots of bubbly will be flowing when the Oscars are handed out on Sunday, Feb. 28, at the Dolby Theater in Hollywood and will be televised live on ABC at 7 p.m. ET. Chris Rock is set to host for the second time.

On Sunday, Larson picked up a Golden Globe for her work in Room.

After the show, she recorded an Instagram video for the Globes. "My favorite moment was after I went back to my table after winning a Golden Globe, Katy Perry had a round of In-N-Out burgers for everybody," she revealed. "Hot and fresh!"

Larson told me after the Globe nominations were announced that she's "super into" jigsaw puzzles.

"They help me stay relaxed," she said.

And that's exactly why I gave her a jigsaw puzzle of a Room poster earlier this month at the Palm Springs International Film Festival. Check out her reaction to the gift in the video below.