Ashton Kutcher on model behavior in Brazil

US model-turned-actor Ashton Kutcher opened the show for Brazilian label Colcci US model-turned-actor Ashton Kutcher grabbed the celebrity spotlight at the Sao Paulo Fashion Week, sauntering down the runway one last time before taking the starring role in the hit TV comedy \"Two and a Half Men.\"
The 33-year-old, who is married to Hollywood star Demi Moore, opened the show for Brazilian label Colcci late Wednesday, walking down the runway with Brazilian model Alessandra Ambrosio.
He then promptly sat down in the audience, where he remained for the rest of the show -- disappointing Brazilian photographers and the crowd, who had been hoping to see Kutcher strut his stuff among the cast of models.
As soon as the show ended, Kutcher was hurriedly ushered out a side exit before cameramen or autograph-hunters could approach.
The low-key appearance was in contrast to Kutcher\'s turn in future episodes of \"Two and a Half Men.\"
He will be replacing actor Charlie Sheen, who was fired after one too many outbursts following well-publicized bouts with alcohol and drugs.
The role calls for Kutcher to play a randy, dissolute bachelor who shares his house with his nerdy brother and nephew.