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Thar she blows! Two humps like miniature snowhills! It is booby Brit!

It was the battle of the waify blonde Englishwomen this weekend, as supermodel Kate Moss and "it" actress Sienna Miller both took to the high seas and liberated themselves from their bikini tops for some topless tanning.

After the cut, find out which blooming English rose accessorizes her bikini bottoms with a married actor . . . and which sports nipples so gorgeously thick they could act as rudders. All hands will be on your deck!

On our shores, Milla Jovovich sports what we at Skin Central like to call G.N.A.T.s—Greatest Nipples of All Time. But across the pond, that honor goes to the great Kate Moss, whose own boob buttons are so deliciously inflated that were she to fall overboard, she'd have no problem staying afloat!

Sienna, on the other hand, sports a more modest (though no less lovely) set of nips and a jaunty captain's cap before hitting a yacht for some quality time with new love, actor and oil heir Balthazar Getty. Getty's smitten with the succulent Sienna for obvious reasons, but one has to wonder what his wife and four children think of the pairing . . . though we're pretty sure we know what we think about Sienna baring her pair!

For more pics of Kate Moss naked on the boat, head over to Egotastic!, and for more of Sienna Miller showing off her topless charms, check out CelebNewsWire.