Heidi Klum at the Los Angeles Premiere of "Star Trek" at Grauman's Chinese Theatre. Hollywood, California - 30.04.09

The German beauty agreed to offer up the Alice Temperley dress she was wearing on the show as an auction item for DeGeneres' ongoing charity drive - and when the host encouraged her to start stripping, the free-spirited supermodel obliged, peeling off the straps of the dress.

DeGeneres held up a napkin to cover the pregnant model but quickly realised the impromptu strip could land her in trouble, so she halted the awkward reveal and a screen was brought on to allow Klum to disrobe safely as striptease music was played.

Klum reappeared wearing a white robe.

The Temperley dress is now available for sale on eBay.com.

Source: WENN