Jason Derulo, Ariana Grande, One Direction & Robin Thicke 'Talk Dirty'
Some guest stars got really, really into it like Robin Thicke and the guys of One Direction, the latter of whom took their shirts off and did a little snake charming. As dirty as it sounds, it's pretty G-rated. Sorry, Directioners.
Some others seemed a little apprehensive like the adorable Ariana Grande, who twirled her hair and did a few Betty Boop style moves for the camera. Clearly, she is a great friend for doing this even though she had her doubts. more on this story
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