The Wisdom of a 3 Year Old

Today I HAD to get my oil changed. Rob threatened to take away my keys if I didn't because I was WAY overdue. So I got there and Jack and I were sitting on the couch waiting for them to be done when another group walked in. The girl was wearing some tight cut off shorts and a very much too small tank top .... and she was not very much too small... it looked a little like this:
Obviously it wasn't this exact photo, this is just a look alike, but more about that in a minute. The blog worthy issue was Jackson's conversation when she walked in.
Jack: (in a very not so quiet voice) Mom! Her butt is sticking out!
Me: (Struggling to keep it together) ssshhh.
Jack: (Not anymore quietly than before) Mom! Her butt is sticking out!
He has a habit of repeating something until he is sure I have heard and acknowledged his statement.... So, for fear of him getting even louder,
Me: I know Jack, but be quiet, when we can see peoples butts we don't talk about it out loud, it's like it's a secret.
Jack: It's not a secret, mom. I can see it right there, her butt is sticking out! Everyone can see it!
I had absolutely no comeback for that. On some level I think he is right. If she is going to show her butt to my 3 year old, maybe I should let him tell her it's sticking out?
The really funny part about this whole experience is that when I was looking for a photo to use I had the above photo up on my computer and Riley walked into the room and took one look at it and said "Is that Grandpa?"