L.A.'s This Is She show why you should never mess with a girl's heart in "Grow Up."

Los Angeles electro-rockers This Is She were formed from the ashes of two former bands that met on the Vans Warped Tour. That's no surprise here -- the raw musical aggression of drummer Ryan Folden and guitarist Christian Paul Meadows, and the unbridled passion of singer Alana Grace could only haven been forged in the summer heat of a punk festival on wheels.

Watch This Is She's "Grow Up" video after the jump.

On "Grow Up," the band's first single off their forthcoming Nobody Is OK EP, which drops July 3, we get to see just how much of a ruthless badass Alana can be. Her beautiful yet blistering vocals remind us of an Amy Lee from Evanescence/ Avril Lavigne hybrid, all laid over dubstep-tinged rock. And if the video's any indication, she's not the one to eff with. The cinematic video begins with Alana quite literally tied down to her bad boyfriend, clearly looking to get out of the relationship that's really ready to be over. She even enlists the expertise of a "Cheaters"-like show to catch him in the act. We don't want to give it all away, but let's just say Alana gets the last laugh in this one.

+ Watch This Is She's "Grow Up" video.