Who let him leave the house looking this stupid?!

Justin Bieber brought rumored girlfriend Hailey Baldwin along to the skate park in L.A. today, and the singer was dressed in an awkward beanie, sweat shorts, and F**k You socks! He should be dressing like a 21-year-old man, not a man child!

The Biebs spends a ton of time with the blonde model, but according to reports, their rumored romance is making her father Stephen pretty steamed! "Justin treated Hailey like crap when they went off to Miami in June," a source told The National Enquirer. Not only that, but her dad noticed the Canadian pop star had left a love bite on his daughter's neck and was none too pleased! "That hickey made him go ballistic and he's promised to straighten Justin out the next time he sees him," the source added.

Can they just admit they're dating already?!