We know Hailey doesn't like it! She was the one who got Justin Bieber to shave his mustache last time he had facial hair and she's used her influence to get him to break out the razor again!

Biebs took to social media, Sunday, to show off his new look, saying he was tired of sleeping alone!

Then yesterday we caught up with Mr. and Mrs. Bieber and asked Justin why he chose to ditch the 'stache ... he told us: "I was eating things, it was getting stuck in my mustache... and now I'm not tickling my wife!"