The actress, 42, popped the question to her other half, 38, who is a sustainable clothing company designer, at Disney.
Posting the happy news on Instagram, she wrote: "We said YES!
"Thank you @tiffanyandco for the stunning ring, and to Bob Iger and the incredible team at Disneyland @disneyweddings for pulling off this magical surprise!"
The star first revealed that the pair were dating in June of last year, and shortly afterwards they announced the birth of their first child by surrogate.
Their engagement announcement on Sunday evening showed the couple pictured together in matching pink and white striped tops in front of the iconic Disney castle.
It has received more than 526,000 'likes', with over 5,500 social media users leaving messages of congratulations.
These included Paris Hilton, who wrote: "Love you girls! So happy for you two! Such a magical way to get engaged."
It is unclear exactly how long the couple have been dating for, but Wilson revealed their relationship last summer on Instagram.
At the time, she wrote: "I thought I was searching for a Disney Prince... but maybe what I really needed all this time was a Disney Princess."
In November, Wilson announced on Instagram that she was "beyond proud" of the arrival of their daughter Royce by surrogate.
Their engagement comes a year after the star hosted the BAFTAs ceremony, the 2023 edition of which took place on Sunday evening fronted by Richard E Grant.
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