Sienna's Breast Stroke

Posted Apr 14th 2008 11:51AM by TMZ Staff

Sienna Miller flops through the nippy ocean on Sunday, suddenly remembering why tube tops went out in the late '80s. Wardrobe malfunctions are all the rage this summer.

Jude Law's ex then decided to air out her feminine wiles altogether and even out her tan. Her lady friend doesn't seem to mind.