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All eyes on Ashton!

He didn't even set foot on the runway and Ashton Kutcher managed to cause a stir at Sao Paolo Fashion Week in Brazil Sunday as he watched a pregnant Alessandra Ambrosio strut her stuff for the Colcci show.

After enduring a crush of photographers and fans when he arrived at the Sao Paolo airport, Kutcher found himself in the middle of a mass of cameramen as he made his way to the Colcci front row.

Mingling with a male seatmate was a switch for the Two and a Half Men star, 33, who brought his then-wife Demi Moore to San Paolo Fashion Week last year.

Showing up almost three hours late to a red carpet event touting Fashion Week in February 2011, Moore and Kutcher -- who modeled in last year's show -- were booed by patrons angry that they held up the event.

At this year's show, however, it was Ambrosio who stole the headlines, as the second-time mom-to-be flaunted her baby bump on the Colcci catwalk.