The Fashion Police co-host, 29, was all smiles at the star-studded Trevor Project event on Saturday (31 May) despite her injury.
Kelly's right foot was enclosed in a large foot brace, visible when she posed for photographers.
So far, she hasn't revealed what happened, only tweeting to fans: "#StressFractures are the worst! At least I get a cool #RoboCopBoot!"
Kelly was among a slew of celebrities at the Prom 2014: A Night Out For Trevor presented by the Trevor Project NextGen in LA.
Fans had the chance to be Kelly's date for the night by donating to The Trevor Project ahead of the event, with one being chosen at random to accompany her.
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