The covergirl wore a daring black gown with a deep plunging neckline that made the most of her ample curves.
The sexy look was topped off with cascading curls and smoky eye make-up.
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Joining Kate at the event to celebrate the 50th anniversary of Sports Illustrated's swimsuit issue was supermodel Tyra Banks.
The star was sultry in a black lace negligee, a beehive half-up 'do and smoky eyes.
Heidi Klum, meanwhile, showed off her long legs in a short red leather trench coat and matching stilettos.
John Legend's wife Chrissy Teigen rocked a tiny black sequinned playsuit and embellished court shoes.
Kate has graced the cover of the Sports Illustrated Swimsuit Issue for the last two years.
The 21-year-old is thought to be reuniting with her ex-boyfriend Justin Verlander. The pair were spotted watching the Philadelphia Flyers vs. Tampa Bay Lightning on Saturday.