The 19-year-old model has gushed about Bieber, admitting he is 'really funny' and has a 'good heart,' reported Entertainment Tonight."He's really funny. We have a good time together. He's just really sweet. He's a good kid, he has a good heart and I love him."Hailey Baldwin wants Justin Bieber to be monogamousListen to songs by Justin BieberWATCH: Justin Bieber - Love Yourself (PURPOSE : The Movement)