Usher is opening up about what life at home has been like since he and his girlfriend, Jenn Goicoechea, welcomed daughter Sovereign Bo last September.While speaking to ET on Wednesday, the 42-year-old singer shared how his other children are adapting to their baby sister. Usher is also dad to sons 13-year-old Usher V and 12-year-old Naviyd, whom he shares with ex-wife Tameka Foster.«Man, my boys are really enjoying having another girl in the house,» Usher gushed to ET's Lauren Zima.