The reality co-stars met up for the relaunch of Diva Magazine at the Ivy Club on Thursday night (11 August), looking oh-so-gorgeous as they posed for the cameras.
Stepping out without boyfriend Alex Bowen, Olivia sizzled in a edgy military green two-piece from Comino Couture. Love the look? You can pick up Liv's EXACT waistcoat and skirt now, although it will set you back £165.
Katie, meanwhile, looked stunning in a dramatic winged jumpsuit with plunging neckline, made just for her by Liverpool designer Jake Phillip Nuttall. Lucky!
The girls stepped out to show their support for the relaunch of Diva magazine, which is the only glossy monthly magazine for bisexual and lesbian women in the UK.
Other stars at the bash included TOWIE's Chloe Meadows and Charlie King, Gok Wan and ex-EastEnders actress Hattie Keane.
Meanwhile, Olivia's boyfriend Alex was over in Northern Ireland doing a personal appearance at a nightclub in Bangor. He was also having a mini Love Island reunion himself, meeting up with co-star Adam Maxted, who is from Belfast.
It's quite funny that Olivia met up with Katie on the same night Alex saw Adam considering Katie and Adam were coupled up in the villa! They finished in fourth place on the show but things fizzled out when the cameras stopped rolling.