Justin Bieber (i before e, except after c) celebrated his 19th birthday this past weekend. It seems like just yesterday he was singing about me plus you. I’ma tell you one time, kids grow up fast. Now, Bieber is wearing his pants below his derrière, smoking weed (allegedly) and wooing the ladies. I don’t care how much that kid is making. His Mom needs to whoop his a**. Pull your trousers up son! I dare my children to make this fashion statement. They wouldn’t leave the house. The Biebs may be one step closer to the legal drinking age, but he is still a whiner. Bieber complained on Twitter how…