@ pop royalty...

she's "a busy working mom" with millions of dollars who has joint custody of her two boys that are in the care of her unemployed ex-husband much of the time.
there're many "busy working moms" in entertainment that don't look nearly as worn and dragged out as she does. she's had time to rest since her tour is now over. with britney's history, it's likely her appearance is more serious than just the affects of a tired working mom.