Her seat will be taken byMel B, who served as a judge alongside Klum for Seasons 8-13.
Also back is host Terry Crews.
Season 20 is set to premiere May 27.
(l-r) Howie Mandel, Heidi Klum, Sofia Vergara, Simon Cowell (inset) Mel BTrae Patton/NBC via Getty Images
She previously did bothAGTandProject Runwayfor five years, from 2013-2017.
Heidi has been an incredible part ofAGT, bringing her signature charm, expertise and warmth to the show.
Wed love for our paths to cross again, a rep forAGTproduction said in a statement.
Klum joinedAGTin Season 8.
Both Hough and Union were gone after one season in an exit surrounded by controversy.
Klum was back in Season 14, joined by new judge Vergara.
Auditions for the 20th season ofAmericas Got Talentare currently underway.
The live shows will kick off at the Pasadena Civic Auditorium beginning Tuesday, Aug. 19 on NBC.
Results shows will air Wednesday nights.
It is absolutely brilliant to be able to announce this year as our 20th season, said Cowell said.
Over the years, we have seen some amazing acts and met some truly incredible people.
Its true that two or three minutes can change your life.
And of course, the amazing team, past and present, who make the show so special.
Now as always, I am really excited to meet the contestants this year.
For the 19th year in a row,Americas Got Talentwas summers most watched broadcast alternative show.
In September, America crowned middle school janitor and talented singer Richard Goodall the Season 19 winner.
