Just the other day, I went into the bathroom to prepare a mop bucket. My reigning princess was sitting upon her throne (the porcelain one).  I bent over the tub to run the water, rinse the mop, and so on.  Apparently my rear-end was right in her line of vision so she had no choice but to inspect it...
and come to the conclusion that, "Mom.  You have a 
big butt." I replied, "Yes I do.  And 
you, Miss Izzy, have a 
small butt."  She then said, in her little dramatically wistful whine, "
Ohhh Mooom, when I grow up I want to be a mom 
just like 
you!"  Then a pause, then, "Even if I 
do have a big butt.  That's okay, right?"  I said, "Yeah, that part's pretty unavoidable.  When you get to be a mom like me, your butt is just going to be 
big."