Jake Gyllenhaal posed for photos and signed autographs for fans outside his hotel earlier today in London. The Prince of Persia star arrived in England earlier this week, and he's been busy with the film's press junket before their big UK premiere on Sunday. There's lots of muscular Jake to enjoy in the movie, and today we got a sneak peek at him showing off his strength in a new clip. Jake apparently took his ab-baring role so seriously that he was constantly shirtless while filming the blockbuster last Summer.