Brie Larson Shares Adorable TIFF Moments with Young Co-star

Brie Larson is all smiles while sharing a fun moment with her co-stars on the red carpet at the Room premiere on Tuesday (September 15) in Toronto, Canada.

The 25-year-old actress was joined by Jacob Tremblay and Joan Allen for the 2015 Toronto International Film Festival premiere held at the Princess of Wales Theatre.

Brie opened up to IndieWire about how she transformed her body for the role of a woman being held hostage in a room for years with her young son.

“The difference is that…my weight is the same, technically I lost 13 pounds of fat, but I gained 15 pounds of muscle, so my body looks the same, but the difference was I had muscle from doing track and doing push-ups in Room all the time and constantly carrying Jack,” Brie said. “He is a five-year-old boy who has a ton of energy, constantly needs to be wrestled with and moved around, and I wanted to be able to feel that. Not only could I be physical with him, but that I could protect myself and him if that man came in and did some funny business.