Before becoming Demi Moore's much younger other half, Ashton Kutcher was walking the catwalk as a sexy model.

So it's no surprise the Two and a Half Men star sat front and center during Sao Paolo Fashion Week in Brazil. He was checking out the fashions of design label Colcci.

The 33-year-old actor, wearing stripes, opened the show walking the runway alongside Alessandra Ambrosio. What a good sport! Although, we have a feeling Mr. Kutcher got a nice paycheck for his brief appearance on the catwalk. Meow!

Ashton and Alessandra recently posed for Colcci's ad campaign. Check it out ... after the jump.