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Why Is Chris Hemsworth's New Nickname 'Daddy'?

The actor joined Twitter just hours before his 'Saturday Night Live' debut.

Chris Hemsworth is having the best weekend ever -- as are his fans on Twitter.

The "Thor" and "The Avengers" hottie hosted "Saturday Night Live" for the first time last night, but before he took to the airwaves, Chris also sent his first tweet. Yes, your Aussie fave just joined Twitter.

How adorable is he? We're very excited about this new addition to the Twitter universe!

And some of his celebrity (and Marvel) pals welcomed him with open arms! William Shatner's tweet is the best. We're definitely going to start calling people "daddy" now.

Two tweets in and we're already swooning! We can't wait to see what else Chris wants to share with the world.