The former Geordie Shore star, 28, shared the news on Instagram, posting a photo of the couple together in which she is wearing a diamond ring.
She wrote: “And just like that I’m now a fiance and I’m marrying the man of my dreams, how did I get so lucky @caseycodyj.”
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She later added: “Who would of thought I got engaged in a £10 amazon dress.”
The couple have been together ever since they met on MTV dating show Single AF in 2017.
They welcomed their first child together, a son named Rox, in October last year.
Johnson shared the same photo on Instagram, writing: “OMG SHE SAID YES!!!”
