German born, Heidi Klum (now officially named Heidi Samuel) was only supposed to host this year’s Victoria’s Secret Fashion Show but ended up surprising the crowd, when she strutted down the runway herself.

She explained why she did it to People. “I felt great the night of the fashion show and decided last minute to walk,” the supermodel, 36… tells PEOPLE exclusively. “I loved my outfit,” she says, “so I thought, why not?

“I’m proud of being the curvy model on the Victoria’s Secret stage,” she says, adding that she enjoyed the show herself.

“The Black Eyed Peas and all of the looks for the show were fantastic!” Six months ago, the fashion model and TV host gave birth to her fourth child with husband Seal. We think she looked great for a mother of four!