Washington, March 4 : Heidi Klum has reportedly signed on to be a fourth judge on Season 8 of the NBC competition show `America''s Got Talent'.

According to TMZ, bosses of the TV show made a last-minute deal with the 39-year-old supermodel.

Klum will reportedly begin filming with her fellow judges on Monday, March 4 during the first round of auditions in New Orleans, Us Magazine reported.

The busy single mother of four will join judges Howard Stern, Howie Mandel and Melanie Brown. (ANI)