Playboy magazine unveils their third annual 'Rock the Rabbit' music issue today, which finds a handful of hot musicians from the rock and hip-hop worlds designing shirts around the Playboy logo. Motley Crue's Nikki Sixx, Perry Farrell, MGMT, Q-Tip and Pharrell Williams all offered up their takes, among a slew of others. To celebrate, we bring you snapshots of Williams' and Sixx's designs, as well as a couple of photos by iconic rock photographer Mick Rock. For more, visit rocktherabbit.com.