The drummer, who lost his arm in a car crash nearly 40 years ago, was attacked in March.
The musician was attacked outside his hotel in Fort Lauderdale on Monday.
Katy Perry, Carrie Underwood and more stars reveal their biggest concert must-haves and pre-show rituals.
Def Leppard chats with ET about their stadium tour with Mötley Crüe, Poison and Joan Jett & the Blackhearts, which begins June 16.
