The pair met during ITV2's second series of the dating show in 2016 and have been together ever since.
Over New Year's 2017, Alex flew Olivia out to New York before getting down on one knee.
"She said yes," he posted online alongside a snap of the couple at the time.
Olivia added: "I have no words for how happy I am. My fiancé my everything @ab_bowen this was magical. So magical."
Now the couple have tied the knot in a ceremony covered by OK! Magazine.
Speaking to the publication, Olivia said: "The wedding was overwhelmingly perfect. It feels like it didn't happen because it was so perfect.
"I had a vision and it all fitted into place like a puzzle. I was totally speechless the day after."
Alex added: "I can't describe it with words. It felt like we were in a movie. It was surreal."
Meanwhile, Olivia said the couple had no plans to start a family just yet.
"Next year is going to be even bigger than this year," she said. "There are loads of things in the pipeline that I can't reveal yet.
"I know you can't quite beat the wedding, but career-wise we've got so much going on. Kids are going to have to wait, I'm afraid."
As for what the couple have lined up, they previously teased a possible appearance on I'm A Celebrity.
Alex told Star magazine in 2017: "Liv and I would love to do the jungle.
"I'd be the worst person to do it, though. I'm scared of everything - snakes, spiders, you name it! But it would be hilarious to watch if I could bring myself to do it."
He added: "It would be great to go on as a couple because Liv could help me through it."