A new book called The Rat Pack has released a collection of never-before-seen vintage photographs of some of your favourite Hollywood stars from the 50s and 60s.

The images offer the public an unprecedented fly-on-the-wall look at what it was like to be part of the exclusive Rat Pack group, which included Dean Martin, Sammy Davis Jr, Marilyn Monroe, James Dean and Muhammad Ali to name a few.

Take a peek at their extravagant lives with these revealing new photos.