Stars clash on 'America's Got Talent'

Heidi Klum and Mel B reportedly clashed on set of 'America's Got Talent' and fellow judge Howard Stern had to separate the hot-tempered twosome.

A source told The that “Both want to be queen of the show. It’s getting nasty!”

When Klum, 42, and Mel B, 40, joined AGT in 2013, the former Spice Girl was prepared to play second fiddle to her leggy German rival, who also hosts Lifetime’s Project Runway. But the source adds that ''Mel felt Heidi was boring and humorless, and realized it was a chance to seize the limelight''.

According to the tabloid, tensions escalated recently when Klum’s beau, Vito Schnabel, 28, visited and the British pop star flirted with him behind Klum’s back!

''Mel’s married and has no interest in Vito, but she did it for a laugh,'' said the source. ''He apparently enjoyed her advances, and Mel gleefully told Heidi she must be crazy to date a guy who can’t be trusted. Mel thought she’d driven a wedge between them, but Heidi just exploded at her. It looked like they might scratch each other’s eyes out!''

That’s when Stern stepped in to play peacemaker, according to the source, who added, “He told both of them to calm down, and if they showed that same fire on TV, ratings would go through the roof!”

Would you want to see Heidi and Mel B clash on live TV?