It's clearly been a rough week for Demi Moore.But while the 49-year-old actress was being rushed to the hospital to be treated for "exhaustion" in L.A., her estranged hubby Ashton Kutcher was working—and playing—in Brazil.A source tells E! News Kutcher is currently in South America doing a shoot for clothing brand Colcci's new catolog with pregnant supermodel Alessandra Ambrosio.The 33-year-old Two and a Half Men star tweeted a smiley photo of himself "surfing the streets of Sao Paulo" Monday afternoon.But the kicker?We hear the...