Topless Femen protestors storm the stage on Heidi Klum's German model show

Two bare-breasted female protesters burst on to the stage at the final of Germany's Next Topmodel TV show, hosted by the German ex-supermodel Heidi Klum late Thursday.

As the finalists appeared with Klum, two Femen feminist supporters, one with "Heidi Horror Picture Show" written in English across her naked chest and stomach, stormed on stage, N24 rolling news channel showed Friday.

"Did I just see breasts in front of me, or did I dream it?" Klum, who turns 40 on Saturday and was clad in a cut-away bubblegum pink dress, said after the brief interruption.

Security personnel swiftly cleared the protesters out.

Based on America's Next Top Model, the German version is broadcast weekly, following the ups and downs in the contest to pick a potential new model from among around 20 hopefuls.

But the show's popularity has declined since its launch in Germany in 2006, and there has been growing criticism that it portrays an image of women based solely on appearance.