Every good homewrecker knows that they have to keep their body tight or else their man friend will go back to his wife and kids, that’s homewrecking 101, Sienna Miller is a good example of this. Here she is leaving her pilates class with her sweet little cleavage in tow. I’ve never done pilates but the idea of a sweaty Sienna Miller flopping around on the floor is enough to make any man leave his wife.

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Photos: SplashNewsOnline, PacificCoastNews