Any mom who would raise a little dirt bag like JUSTIN BIEBER can't be much of a mom, right? Well, Justin gave us another way to look at it in a post to his mom on Mother's Day. He said, quote, "This woman taught me everything I know, how to love how to be compassionate how to be strong when the only thing u wanna be is weak how to stand when all you want to do is fall.If it wasn't for this woman let's just say I would have had a way LONGER stupid phase. I love u and thank u for not giving up on me!" Meanwhile, "Us Weekly", The Huffington Post, and E! Online have galleries of celebrity Mother's Day posts. (E! even posted a second gallery.)

And REESE WITHERSPOON's "Saturday Night Live" monologue included a bit where she and the cast apologized to their real moms for stuff they did when they were kids.

Elsewhere on the Mother's Day front, LORDE thanked her mom for once cussing out a bully who made fun of her mono-brow . . . and TAYLOR SWIFT wrote a really sweet message to a girl who was hurting because her mother is dead.