Carey Mulligan waited for a friend to arrive at the airport in Sydney on Tuesday. She's in Australia filming The Great Gatsby alongside Tobey Maguire and Leonardo DiCaprio, and the cast has been spotted hanging out together when they aren't on set. Carey and Tobey have checked out the Sydney Opera House, as well as the beach with his family. Carey was sporting a sparkly piece of jewelry during their sandy day, leading to rumors that the actress and her boyfriend Marcus Mumford were taking their relationship to the next level. It looks like the talk was true since Carey wore the engagement ring again at the airport this week. She and Marcus, who is the lead singer of the band Mumford & Sons, have apparently been friends since childhood and became engaged after just five months of dating.