Gwyneth Paltrow, Michelle Williams, Jessica Biel: Who Wore the Most Expensive Jewelry at Tiffany's Blue Book Ball?

Gwyneth Paltrow, Michelle Williams, Jessica Biel all wore expensive borrowed Tiffany jewels to the event. Credit: Dimitrios Kambouris/Getty Images; Dimitrios Kambouris/Getty Images; Dimitrios Kambouris/Getty Images

Gwyneth Paltrow, Kate Hudson, Michelle Williams, Jessica Biel, Carey Mulligan, Sarah Jessica Parker. Hollywood's beautiful A-listers flocked to storied jeweler Tiffany & Co.'s Blue Book Ball, their star power rivaled only by the gobs of glittering necklaces, earrings and bracelets they donned in honor of the swanky affair.

PHOTOS: Gwyneth through the years

At the NYC event on April 18, Biel wore borrowed Tiffany baubles that totaled $240,000; Hudson, $255,000; Parker, $495,000; Paltrow, $640,000! Mulligan's Art Deco diamond ring alone cost a cool $800,000. That it was the British actress who would be showcasing the night's costliest piece is understandable. The ball was a Jazz Age-themed event that celebrated the jeweler's new capsule collection inspired by her upcoming 1920s-set film The Great Gatsby.

PHOTOS: ??SJP's fabulous footwear!

But it was Mulligan's doppelganger, Michelle Williams, who won the prize for the most blinged-out actress at the event. She slipped on not one, but two Tiffany bracelets (one of which bore pink diamonds) that totaled $750,000 as well as a diamond ring worth $150,000.