Heidi Klum, Anna Kendrick, Zach Braff, Josh Groban, Rob Delaney, Olivia Wilde and Dwayne "The Rock" Johnson all got into it on Twitter. It was a brutal, bitter, no-holds-barred affair. [via:Yahoo omg!]
Josh Groban chose an audience member to duet with him, and she turns out to be vocally gifted.
