Another concert, another original Abbey Dawn shirt. What's your secret, Avril? Ms. Lavigne hit the stage at her Vegas Show last night in a brand new, striped pink and black t-shirt design. Bandaids member GretaLavigne93 was lucky enough to be there on the night, and even luckier for us, he managed to get a taping of Avril performing "My Happy Ending" and fan favourite "I Can Do Better": both peformed in her hot new Abbey Dawn tee! Check out Avril's newest design here!