Justin Bieber and Ty Dolla $ign don't just bond over their shared love of music. The singer, 31, and the rapper, 43, are also proud dads, with Dolla $ign (real name Tyrone William Griffin Jr.) exclusively revealing to Us Weekly the best advice he ever gave Bieber about fatherhood. Calling the Swag II artist a "great father" to son Jack Blues, 13 months, whom Justin shares with wife Hailey Bieber, Dolla $ign said, "I'm proud of him, you know, if anything, I probably just told him to be there as much as you can. That's all you can do.