Glenn popped the question to his now fiancée on Wednesday in their hometown of Perth.
"MEET MY FIANCÉ! 😭🎉💛13.10.21 - Sunset at South Perth Foreshore. My heart is bursting," Alisha wrote in her Instagram caption.
Glenn shared his own loving post writing: "She said yes! 💍 I get to marry my dream girl and best friend! Words can't express how happy I am, Not just today but every day! The moment I met you in Fiji I knew you were the one. I love you ❤️ @alisha.aitkenradburn. Ps. You still haven't finished your paint by numbers "
Bachelor alumni were quick to share their messages of congratulations.
"Omg omg!! CONGRATULATIONS!! Lucky we looked at dresses the other day! So happy for you both ❤," remarked season eight winner Irena Srbinovska, who also lives in Perth with Bachelor boyfriend Locky Gilbert.
"Omg. Congrats. Crying rn," season seven runner-up Abbie Chatfield penned.
"THIS IS THE BEST!!!!! Congratulations you beautiful couple," exclaimed Laura Byrne, who won the show and Matty J's heart back in 2017.
WATCH: Bachelor in Paradise's Alisha and Glenn share video montage as they go public with their relationship
Alisha first rose to fame on Nick Cummins' season of The Bachelor in 2018. The year after she starred on season two of Bachelor in Paradise but it was third time lucky when she met Glenn, a former suitor of Angie Kent, during her second stint in Paradise.
Shortly after the season aired, the pandemic hit and Alisha made the bold decision to pack up her life in Sydney and move over to WA to be with her new boyfriend.
In May, Alisha confessed to Who that she didn't think tying the knot was in her and Glenn's immediate future.
"I think that's still a little bit away for us. I'm not super big on marriage – I definitely want it to happen one day but I'd be happy to do some babies first," she admitted, adding that she doesn't want to stop at just one.
"It was just me and my mum growing up and Glenn has such a big family. I want my kids and grandchildren to all be running around."
This story originally appeared on our sister site Now To Love.