NY Bloger

Supermodel Heidi Klum amazed a TV show audience as she took off her dress on stage – and joked about having a pregnancy ‘muffin top’.

The 35-year-old looked stunning as she marched onto the Ellen DeGeneres show wearing a revealing outfit.

But, after agreeing to donate the dress for a charity auction, she upped the ante even further.

Klum took down both straps as she pretended to begin to undress on the spot while the host held a tiny piece of cloth in front of her.

She then walked off the stage holding up the dress with her hands and went behind a screen.

To wild cheering from the crowd, she theatrically took off the outfit over her head – with the help of an assistant – and smiled over the screen.

She then emerged wearing a pink bathrobe and walked back to continue her chat with Ellen.

Earlier the pregnant mum-of-three she showed off her baby bump and joked about a wider figure – and slower mind.

Klum said she has “much more muffin top” than her previous pregnancy.

She then added: “I’ve a little bit of pregnancy brain freeze. I don’t know what it is, I always forget things. It’s always, like, ‘the words… where are they?’”

She also revealed she does not know the baby’s sex but that said this would be her and husband Seal’s last child.

“We weren’t planning (to have a baby) but we also weren’t not planning either. We were kind of leaving it open.

“We were always looking around the table and thinking ‘one more would be nice’.

“And we kind of took it one baby at a time and every time we thought ‘yeah, one more and that’s it…’ now this is the first time I felt like this is it.”

Her dress is being auctioned online on eBay in aid of the Humane Society, with bidding – due to last around two days – well into the four figures already.