Nelly Furtado has gotten engaged to her sound enguneer boyfriend, Demacio "Demo" Castellon. The Grammy winner worked with him on her 2006 hit album "Loose." Furtado, 28, had told Blender magazine last July that she had a "secret boyfriend' of 8 months, saying :"I just don't really talk about it. it's nobody famous or anything." Furtado has a daughter, Nevis, 3, with DJ and producer Jasper "Lil' Jaz" Gahunia.