The reality star looked gorgeous in a high-necked champagne-coloured dress as she headed out in London on Friday (30 October) to help Chloe celebrate her big day.
And the girls got a surprise when they bumped into Mr Grint!
Jess posted a picture to Instagram showing herself posing with Rupert, who played Ron Weasley in the Harry Potter franchise. "Lovely meeting@rupertgrint_official tonight. A gentleman #HarryPotter #RonWeasley."
Plenty of fans were quick to comment on how lucky Jess is, including one called amylowe_xo who joked: "It isn't bad enough she's cracking on with Pete. Now she's met him an' all!"
Jess and Chloe were joined by Danielle Armstrong, Ferne McCann and ex-TOWIE star Frankie Essex for their big night out at Toy Room Club in London.
TOWIE airs Wednesdays and Sundays at 10pm on ITVBe.
Ten reasons why we want to be on TOWIE!