They're performing right now at the iTunes Festival, if anyone wants to watch. They just finished "Girls Are Always Right" and started "Show Me What You Got."
I think the link only works on OSX on Safari, but you can also watch on iTunes or the mobile Vevo app.
Show Me What You Got, Wild Wild Love, and Ugly Heart are my jams! I'm starting to stan for G.R.L. now. I really like the sound they are going for and I think they have the potential to really smash.