Pink, Mike Tyson, Pamela Anderson, Robbie Williams, Eminem, 50 cent, and many other celebrities have showed off their tattoos, which come in all shapes and sizes.

Among actors, singers or, simply put, celebrities, wearing works of art on their bodies has become mandatory, in much the same manner as expensive cars, unusual pets, and designer clothes have.

Tattoos have become a trend in Hollywood. See the PHOTO GALLERY of the most unusual tattoos.