"Oh. My. God! Surprise engagement party. Last night we flew back from Melbourne and @tobi_pearce was silent in the car. I said 'I feel like something is weird'. He smiled and said '... you have an hour to get ready'. I said 'WHAT? .. for what? Where are we going'. He didn’t respond," she wrote.
"He dropped me off at my friends dress shop, there was a makeup artist, hair dresser and 5 dress options on the table. I was thinking ... what is GOING ON!!? I got ready, and got back in the car. He handed me a blind fold, 15 minutes later he walked me slowly into our house where he took OFF my blind fold and there was 130 family and friends around us in a marquee.
She added: "I honestly just started crying! We’ve been so busy, I totally forgot to take a second to celebrate our life. It was such a beautiful night. Thank you to my amazing family and friends for making last night so beautiful!! Tobi, I love you with all my heart 💖 As usual you’ve gone out of your way to make everything perfect and your speech was incredible. I can’t wait to marry you next year, thankyou for all you do my chicken."
Kayla wore a beautiful strapless gown that complemented the event's white theme.
The loved-up pair posed underneath a floral archway which read 'The Pearce Family'.
The couple met in 2012 and have gone on to build a fitness empire worth an estimated $486 million.
Kayla is currently pregnant with her first child.
Speaking to Women's Health, Kayla said: “I’ve wanted kids ever since I met Tobi and it’s something we have always talked about," the 27-year-old said. "It turns out that when we were ready it was just perfect timing."