Forget about Sia... Lena straight up embarrassed me with this performance.

I stopped watching after about 45 seconds and just listened to it instead because her moves were a mess. They shouldn't have ever tried to do a performance without the original girl.
Anyways, I can definitely hear similarities between both the Ellen performance and this, so I wouldn't be surprised if it was lipped. Either way, the Ellen performance definitely trumps this one anyways.
