Ruffalo, who is nominated for 'Best Supporting Actor' in The Kids Are All Right, decided to tweet his Oscar speech in case he does not win tonight.
"So just in case I don't win tonight and even if I did, the Academy forbids thanking people in your speech I would like 2 selfishly use tweets. Thank You Sunrise, (sic)" wrote the actor. "My wife and my partner in crime and fun and hard times and joy and sadness in heartbreak and healing and dinners and kids."
He continued by thanking his director and co-stars, as well as the crew.
The actor also tweeted about his mother, who was interviewed for the Oscars.
He added: "My Mum is one of the Mominees. They interviewed her for the Awards. You may get some interesting and embarrassing stories. I love you Mum."