Cameo appearances can make for some of the greatest moments in movies. Remember seeing Alice Cooper in 'Wayne's World'? Stan Lee in 'Mall Rats'? Mike Tyson in 'The Hangover'? Or, possibly the greatest cameo of all time, Bill Murray in 'Zombieland'? Well, for a show set in and around Hollywood, based on the exploits of rapper/actor/executive producer Mark Wahlberg, it was understandable why HBO's 'Entourage' has more than its fair share of A-list cameos.

'Entourage' is set to hit US theatres on 5th June, 2015.
'Entourage' is set to hit US theatres on 5th June, 2015.

Over the course of its seven-year runtime, 'Entourage' racked up a very impressive list of cameo performances, including Jessica Alba, Scarlett Johansson, Hugh Hefner, Peter Dinklage, James Cameron, Seth Green, Snoop Dogg, Peter Jackson - you get the idea. There were an awful lot of people getting involved in 'Entourage', so it stands to reason that when the trailer for the feature adaptation launched, people were eagerly looking to see who would be making an appearance outside of the main cast.

More: The 'Entourage' Movie Is Officially GO. Today is a Good Day.

Obviously, Mark Wahlberg (the show's executive producer) makes an appearance after showing up five times during the series. Also making an appearance were Billy Bob Thornton and 'The Sixth Sense' star Haley Joel Osment. But then things became especially surprising, when MMA fighter Ronda Rousey appeared hinting at a significant role in the film. Oh, and Calvin Harris, in his first onscreen performance.

Watch The Trailer For 'Entourage' Here:

The film takes place 6 months after the final episode of the television series, and follows the story of a group of Hollywood misfits who have finally been given the chance to create their own movie. The problem is, it is 15 million USD over budget. After securing an investment from a Texas billionaire, the group realise that this debut had better be really good - or even retreating back to the obscurity of Queens won't save them.

More: 'Entourage' The Movie: Everything You Need To Know

Adrian Grenier, Kevin Connolly and Kevin Dillon star in 'Entourage'
Adrian Grenier, Kevin Connolly and Kevin Dillon star in 'Entourage'

Jeremy Piven in 'Entourage'
Jeremy Piven in 'Entourage'

Haley Joel Osment in 'Entourage'
Haley Joel Osment in 'Entourage'

Billy Bob Thornton in 'Entourage'
Billy Bob Thornton in 'Entourage'

Calvin Harris in 'Entourage'
Calvin Harris in 'Entourage'