Brie Larson and Jacob Tremblay's on-screen connection as mother and son in Room is just incredible, but even off screen they're great friends.

After filming together, doing countless interviews, the full awards circuit and tonnes of promotion all over the world, the pair have a gorgeous bond, despite their 17 year age gap – Jacob is nine and Brie is 26.

Last night the pair marked their final day of promotion for the film with a toast in Japan, just as they had done two years previously when the film had its first screening at the Telluride Film Festival.

"28 weeks ago(according to Instagram) @roomthemovie premiered at the #telluridefilmfestival. After the screening @jacobtremblay and I toasted. He had chocolate milk and I had red wine," Brie wrote. 

"I remember feeling so vulnerable after sharing this movie with the world for the first time; unsure of what was to come.

"Last night marked what may be our final toast to this film . He had a soda and I had sake. We are in Japan."

The actress went on to share some lovely memories of the time she had spent with her young co-star.

"Together we have travelled the globe, spent almost two years hanging out, playfully arguing about things like who can hold their breath longer and talking at length about Room.

"At its core, every step of the way has been taken with love. We were generous and patient with each other. We laughed a lot, especially when it was hard.

"We picked each other up, answered for the other when one was tired and always kept silliness alive.

"Thank you Room for bringing us together. Thank you Room for uniting us with the rest of the world. Thank you to everyone who shared this journey with us. I will never ever forget it."

Jacob shared Brie's post over on his own Instagram, saying he had had "the best time" and adding "bye bye room," in an echo of the film's last line.

We're going to miss these two together… now to wait for Emma Donoghue to write a sequel.