In pictures: this summer’s blockbuster haircuts Forget action scenes, this summer the blockbuster is all about the barnet and Hollywood's leading men are providing some much needed hairdo direction Tweet The Wet Look Robert Pattinson in Cosmopolis. Difficulty rating: 2/5. Tip: there can never be too much gel. Photograph: Sportsphoto Ltd/Allstar The Don’t Wash and Go Sam Riley (on left, with co-star Garrett Hedlund right) in On the Road. Difficulty rating: 0/5. Advice: requires dirt and a handsome, stubbly face. Photograph: Sportsphoto Ltd/Allstar The Slick Lick Leonardo DiCaprio in The Great Gatsby. Difficulty rating: 5/5. Tip: potential to end up a bit fancy dress. Photograph: XPUSAUSSIE The Big Top Andrew Garfield in The Amazing Spider-Man. Difficulty rating: 3/5. Warning: this is all about height. Thick hair essential. Photograph: Sportsphoto Ltd/Allstar The Severe Sidepart Michael Fassbender in Prometheus. Difficulty rating: 4/5. Warning: Blond locks a must. Not for the shy. Photograph: Public Domain The ‘Just Been Cut’ Joseph Gordon-Levitt in The Dark Knight Rises. Difficulty rating: 1/5. Warning: requires regular upkeep. Photograph: Greg Allen/Rex Features