Ke$ha and Jimmy Kimmel
Ke$ha is like Marmite, you either Hate her or Love her. Me, I love the trashy look and the carefree attitude. It's a nice contrast to a lot of artists who take themselves too seriously at the moment.
Below Kesha performs "Tick tock" and "We R Who We R" On Jimmy Kimmel Live. The vocals aren't really worth commenting on, and the performance was uninspired and tired... but I still love her though!
Embedding for her performance of We R who we R has been disabled but watch it on Youtube here