The week in film - in pictures

Call that an armoured car? The entourage of General Aladeen, Supreme Leader of the Republic of Wadiya arrives at a public ceremony in the centre of London. In other words, actor Sacha Baron Cohen and crew turn up for the premiere of The Dictator at the Royal Festival Hall Photograph: Jon Furniss/WireImage Baron Cohen steps out and fondles his golden gun in front of the crowds. Can't say the presidential guard look too entranced; the ones at the back are practically asleep. Wake up, this man could be assassinated at any minute! Photograph: Tal Cohen/AFP/Getty Images Oh look, a lone protester has broken through the police lines, but Baron Cohen bravely takes him on. As the protester in question is clearly Harrods owner Mohamed Al Fayed, I don't suppose anyone's life is in real danger Photograph: Fred Duval/Getty Images Here's proper talent: Ben Stiller looking all director-y on the set of The Secret Life of Walter Mitty in New York. Stiller's actually got a great record as a director: Reality Bites, The Cable Guy, Zoolander, Tropic Thunder; the guy deserves a medal Photograph: Bobby Bank/WireImage A smart bit of promo from the people behind low-budget UK indie The Silver Goat – the 'first ever' iPad film premiere, so they say, in a London bus shelter. Here's the cast; lead Alexa Brown is the one in the middle Photograph: Sam Pearce/www.square-image.co.uk Here's how to do a premiere properly. Gossip-mag staple Rihanna is snapped by photographers as she makes her way on Thursday into the US premiere of Battleship , her first big Hollywood number. Wonder why she gets so much attention Photograph: Danny Moloshok/REUTERS When you're a Hollywood big shot, you need at least three people to help you get through a door. Bruce Willis, on the set of Die Hard 5 (aka A Good Day to Die Hard) in the Hungarian capital Budapest, takes pampering to a whole new level. So that's why he's got that smirk going Photograph: Bea Kallos/AP More premiere action: Josh Brolin, Will Smith and Tommy Lee Jones make an entrance for Men in Black 3 in Tokyo. Smith's suit wins by a nose Photograph: Rex Features/Aflo Here's how to really impress. Jack Black and Kyle Gass, in their guise as 'funny' rockers Tenacious D, play for actual normal people on a street. Don't think they were busking as such; they were apparently filming a show for the website VEVO. Never mind, everyone looks happy – apart from that kid, who just looks confused Photograph: Angela Weiss/WireImage How to get a grant, part 47. Polish animator Zbigniew Rybczynski gets all knightly with Neelie Kroes, European Commission vice-president in charge of the Digital Agenda, at an EC meeting in Brussels. Absolutely shameless Photograph: Olivier Hoslet/EPA Helena Bonham Carter has a good go at emulating her poster image at the Dark Shadows premiere in London's Leicester Square on Wednesday. Nice try – but, duh, it's the wrong hand Photograph: Jon Furniss/WireImage