Jessica attended the event on Saturday night along with her TOWIE co-stars and cheered on Elliott as he went up against Lewis in the ring in Romford, Essex.
Even Jessica's brother Mark was there to support their cousin!
Jessica has now shared some new pictures taken on the night, which show her loved-up with boyfriend Ricky Rayment and hanging out with her best girls.
The star looked sizzling in a red dress with plunging neckline and spiked straps, from Official Rare London, and was snapped with her arm around Ricky - who was suited and booted - as they waited for the fight to begin.
Meanwhile, Jess was also pictured with her mum Carol and co-stars Ferne McCann and sisters Sam and Billie Faiers, who is pregnant with her first child.
Alongside the photograph, Jessica simply commented: "Ma girls."
Who knew boxing could be so glam?!
Elliott won the boxing match, after knocking out Lewis in 30 seconds...
Are you enjoying TOWIE? Tell us below, as the best comment from across the website each week wins £50!