But she still oozed all the glam - even with that pesky hand cast.
Casey made everyone stop and stare when she rocked up to the event at swanky Kensington Roof Gardens in this incredibly booby number that made her look a little like a modern day Jessica Rabbit. Can you see it, too?!
Casey looked hot-to-trot in the cleavage-baring dress that also boasted an eye-wateringly high thigh split detail and piqued shoulders - but as always, she managed to pull it off without finding herself at the centre of an embarrassing wardrobe malfunction.
A total pro, we guess!
Our eyes were soon averted to Casey's absolutely stunning 50s-inspired hair, as she ditched the sleek and straight look for cascading waves, blowing the rest of the guests out of the water.
Casey joined the likes of EOTB star Megan McKenna, Geordie Shore's Marnie Simpson (who left very little to the imagination, FYI) and TOWIE's Danielle Armstrong at the event but a slick of pillar box red lipstick and a killer tan was all she needed to stand out from the crowd.
London Marathon fundraising event, Jog On To Cancer, is in aid of Cancer Research UK. To find out more about Cancer Research UK's 2017 marathon team visit cruk.org/marathon
For exclusive competitions and amazing prizes visit Reveal's Facebook page NOW!