Orlando Bloom celebrated his 35th birthday today and kicked off the celebrations with a hike through LA's Runyon Canyon. He was joined by his wife, Miranda Kerr, their 1-year-old son, Flynn, who also celebrated a birthday this month, and their four-legged companion Sidi. Miranda wore casual fitness gear for her morning with the boys, but last night she modeled a sexy red Georges Chakra dress at the Qantas Airways Spirit of Australia Party. The supermodel recently signed on as an ambassador for the airline, and she seems to be really excited about her latest gig. As for Orlando, he's back in the States following a recent stint in New Zealand, where his latest big-screen project, The Hobbit, is being filmed.