If there's one TV actress I love more than most it's Chuck's leading lady Yvonne Strahovski who plays Sarah.
The video below is by CollegeHumor.com and features Yvonne taking the mick out of Katy Perry, Ke$ha, Lady Gaga and then Justin Bieber... Crazy but cool!
And just for kicks I've added some pics of Yvonne from the video for you!