Sienna Miller slipped into a tiny white bikini to sunbathe in Positano, Italy yesterday. She took a break from PDA time with Balthazar, enjoying an afternoon by the pool with her book while he went out jet skiing. They seem to be going strong despite what anyone else may think, but she'll have to wrap up their Mediterranean vacation soon to start promoting GI Joe.
To see more photos of Sienna in her LWB just
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