Clearly unfazed by the possibility of a nip slip, each lady flashed the flesh in slinky frocks as they made their way down the red carpet at the London Coliseum.
First to catch our attention was Alexa, who looked pretty as a picture in a stunning strapless white dress by Stella McCartney.
The presenter - who recently launched a make-up collection for Eyeko - wore black pointed heels, adding a cute metallic clutch and red lippy.
But while Alexa shone in her sweet and chic number, Bradley Cooper's girl Suki pushed the boundaries in a sheer plunging frock which left little to the imagination. Yikes!
Sienna and Pixie also chose to go bra-free in their floor-length numbers, which featured daring long spaghetti straps.
Pixie sported a silver satin frock, £55 from Topshop, and vampy lips while toting quite possibly the strangest handbag we've ever seen.
A green cuddly toy doesn't exactly scream 'swanky fashion awards accessory' but hey, each to their own.
Sienna was also more than happy to show off some skin, but failed to impress in a rather drab emerald green dress by Burberry.
Let's hope they all had some tit tape stashed away in their clutches!
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