Plus, Will Arnett came back to play Batman!
Tegan and Sara's performance of their song from 'The Lego Movie' with The Lonely Island was full of surprises -- like Will Arnett dressed as Batman!
ET sat down with 'The Millers' stars Will Arnett and Sean Hayes to preview tonight's season two premiere.
Amy Poehler gives a very candid account of what it's like to go through a divorce.
'Big Brother' host Julie Chen televised her ALS Ice Bucket Challenge.
The TV shows finding new life at a new home.
Conan O'Brien, Andy Richter and Will Arnett paid their respects to Robin Williams after learning of his death.
Will Arnett won't be getting his black belt in Karate Pinata anytime soon.
After separating in 2012, Will Arnett has filed for divorce from Amy Poehler.
Roseanne Barr returns to TV and is as outspoken as ever in this clip from tonight's The Millers.
In today's ET to GO: The LEGO Movie stars Will Ferrell and Will Arnett explain why the classic kids' toy endures - and who wins "cool points" from their little ones!
Which Stars Win LEGO Cool Points from Kids?
Heigl & Arnett Plot 'The Nut Job' For Their Kids
Batman Shines In Explosive New 'LEGO Movie' Art
