The former sales exec, 22, shared a Snapchat on Thursday (4 August) showing her posing in a bikini while in Marbella.
Her caption read: "Can we all accept no Photoshop now guys?"
And in a second photo, she added the message: "GOT IT NOW? Thanks to my babes that have brain cells and know I'm not."
Olivia's bikini pictures came after she posted a firm denial to Twitter, saying she does NOT use Photoshop to alter her waist in imagery and won't be speaking out on the matter again.
"I'm not posting this to try and justify anything," she wrote, "however I feel strongly about being honest and truthful with my fans and followers and hate to think you think I'm lying to you.
"I will take it as a compliment that people think I Photoshop my waist .Let's remember TV adds a few pounds and appreciate I have lost weight since being out of the villa. I also know how to take a god damn good photo and work my angles, Maybe I'll do a tutorial on that next so you can all be accused of using Photoshop too."
Olivia and boyfriend Alex Bowen finished second on the most-recent series of Love Island, behind winners Cara de la Hoyde and Nathan Massey who shared the £50,000 prize.
They've been inseparable since leaving the villa in Majorca last month, but Olivia's now jetted off to Marbs on a girls' holiday, while Alex is back in the UK doing personal appearances and catching up with islanders Terry Walsh and Tina Stinnes!