Sienna Miller was decked out in gray layers for a walk along Sydney's Bondi Beach yesterday morning. She's in Australia gearing up for the release of GI Joe there on August 6. Sienna made the rounds at the MTV Movie Awards in June on the arm of her costar Channing Tatum, who will join her on the promotional tour as a newlywed. He'll be fresh off his honeymoon with Jenna Dewan, but it looks like Sienna's also fitting in a little relaxation before the interviewing starts.


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