Heidi Klum has signed on to be a judge on America's Got Talent.

The German supermodel has reportedly inked a deal to become a fourth judge on panel alongside Howard Stern, Howie Mandel and Mel B on the reality TV show. According to gossip website TMZ.com the 39-year-old beauty, who has four children with her musician ex-husband Seal - agreed to appear on the popular series after last minute negotiations.

The Project Runway host jumped on a plane to New Orleans on Sunday in time for the first taping of auditions for the show, which begin on Monday. Heidi's signing comes just a week after former Spice Girl Mel B, 37, confirmed she will take over from Sharon Osbourne this season.

Previous judges also include Simon Cowell and Piers Morgan.