Mel B says the new America's Got Talent judging panel is a "discombobulated" but "feisty" group.

The Spice Girls singer is to judge on the new season of the hit talent competition along with supermodel Heidi Klum and says the panel - which includes radio personality Howard Stern and comedian Howie Mandel - all have unique quirks that makes for an interesting dynamic on set.

"They're really nice actually. We all get on. We're a bit of a feisty panel. We all hang out afterwards; so far so good. [Howard] is completely inappropriate and out of everybody on the panel, I get along with him the most! Howard is a bit grumpy sometimes. Heidi Klum is very sweet; we're really good friends. Howie Mandel is a germaphobe - he rides around in his private jet, and then me and Heidi get to ride around in his private jet, too, but you still can't touch his hands! So between the four of us, it's a completely discombobulated group that somehow get on."

While America's Got Talent is a family friendly show, the 37-year-old star admits the off-camera banter between her and fellow judge Howard, 59, has a more adult tone: "He always talks to me about sex in between each act on the panel. I just make up random stories and half the time he actually believes me."