Joe Jonas and Sophie Turner are engaged, and the singer’s family couldn’t be more welcoming to their new addition. “Everybody’s very, very happy for them and their family and friends are all thrilled. Everyone loves them together,” a source tells PEOPLE of the exciting news. Adds the insider, “She’s young but is beyond her years and is crazy, crazy mature. He’s never been like this with a girl.”“He was such a dater before her but their relationship was much different from the start.