“AGT” announced the news on Instagram Thursday.
“There’s a new judge joining the #AGT FAMILY! Introducing @simoncowell, @howiemandel, @heidiklum, AND @sofiavergara as the Season 15 Judging Panel, with @terrycrews as your host!”
Heidi Klum will also return as a judge for the upcoming season, along with Howie Mandel, Terry Crews and Simon Cowell.
Vergara is just coming off “Modern Family,” which will end in April after 11 seasons.
In December, Union wrote she had met with NBC and “AGT” representatives to address her departure and the culture at the show.
“I was able to, again, express my unfiltered truth. I led with transparency and my desire and hope for real change,” Union wrote.
NBC, along “AGT” producers, said in a statement to CNN at the time they were “committed to ensuring a respectful workplace for all employees and take very seriously any questions about workplace culture.”
CNN has contacted representatives for NBC for an update on the story.