In this Wednesday, July 25, 2012 photo, a blimp flies in the sky as the sun sets behind the Olympic Stadium at the 2012 Summer Olympics, in London. A world city that needs no introduction, but scarred by terror bombings, riots and economic crisis since picked as Olympic host seven years ago, will launch the 2012 summer games with a spectacular opening ceremony Friday faced with a unique challenge: to be as memorable as Beijing's planet-wowing, money-no-object Olympic extravaganza of 2008. (AP Photo/Ben Curtis)

Here's what's happening today in pop culture:

• All eyes will be on London today, with the beginning of the 2012 Summer Olympics. It all starts with the opening ceremonies, so The Guardian helpfully provides us a nice profile of the show's director, filmmaker Danny Boyle. [The Guardian]

• Keira Knightley told Empire magazine that she made a deliberate decision to find roles in independent movies, and steer clear of blockbusters and the fame-whoring that comes with them. "It comes to a point where you think, 'What kind of film can I make that will allow me to live a proper life?' And those tentpole movies make it difficult," she said. [The Huffington Post]

• Green Day's Billie Joe Armstrong is joining NBC's singing-competition show “The Voice,” as a mentor backstopping Christina Aguilera's team. [Entertainment Weekly]