The 39-year-old star shared the news on Instagram.
"This sweet and loving man has stepped into our lives and stole both our hearts! I think we're gonna keep him around for a while #engaged #isaidyes #jackdonnelly #family #yes," Akerman wrote.
The pair first sparked romance rumours back in March 2017 when they were spotted packing on the PDA in Puerto Rico.
Akerman was previously married to musician Roberto Zincone.