"He's a very calm and thoughtful person and I've always been interested in his mind and his take on life, and his morals. He loves talking about the environment and food production."
The engagement comes three years after her split from Purple Wiggle Lachlan Gillespie.
Watkins and her co-star Gillespie's highly-publicised split dominated headlines in August 2018, but the two have remained close friends and co-stars since their marriage breakdown.
At the time, Gillespie said that they were the best of friends — "we always have been, that's how it started".
He said they were like any other couple and just realised they had reached a stalemate in their seemingly picture-perfect relationship.
"To be able to realise as a couple that we were going different ways and to stay as close as we are is a real testament, I think, to both of us," he told the publication.
"I love her more now than anything and she loves me more than anything."
Watkins told Australian Story that year that there was a growing awareness between her and Gillespie that "romantically, it just wasn't going the way that our friendship was going".
Gillespie himself replied to Watkins' post on Monday night with a series of purple love hearts and wrote: "Love you guys".
