Before Proposing to Hailey

Justin Bieber‘s a sucker for old school traditions — he made sure to ask Hailey Baldwin‘s father for her hand in marriage before he popped the question … TMZ has learned.

Sources close to the couple tell us Justin and Stephen Baldwin met face-to-face several weeks ago. We’re told the conversation was very important to the Biebs, who absolutely wanted the green light from Hailey’s pop. Stephen is a minister in NY, and we’re told he believes Justin has the same Christian values as he and Hailey do — and, of…