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Suki Waterhouse, Serpentine Gallery Summer Party

Ian Gavan/Getty Images

Hey, if you've got it...there's almost no need to cover it!

Suki Waterhouse truly stunned today at the annual Serpentine Gallery Summer Party in London, her double-stick tape again working overtime as her ethereal mint-green Valentino gown was cut especially skimpily up top.

Sideboob everywhere!

But that just may be how Suki rolls, the model being rather fond of barely there tops. Thursday, however, she brought another kind of reinforcement should her dress have veered into possible-malfunction territory—little sister Immy Waterhouse.

Suki Waterhouse, Immy Waterhouse, Serpentine Gallery Summer Party

David M. Benett/Dave Benett/Getty Images for The Serpentine Gallery

Immy wore mint green as well, only she went for long sleeves and a scoop neck. So while both sisters obviously emerged from the same charmed gene pool, Immy—who at 21 is just a year younger than her famous sis—appears to have different taste in the evening-wear department. Suki also carried a delicate clutch from M2Malletier while Immy toted a far larger bag. (Well, someone had to carry the tape!)

The siblings joined a star-studded crowd tonight at the Serpentine Gallery that included Kate Hudson, Benedict Cumberbatch and Sophie Hunter (making their first red carpet appearance since becoming parents), Lara Stone, Toni Garrn, Chiwetel Ejiofor and Poppy Delevingne with hubby James Cook.