kita, howdy!
when i mention this to other people, they usually have similar stories.
it all started when she was a kitten and would watch me shower.
she was always curious and would sit on the ledge while kneading on the shower curtain. after several months, she would peak her head in AND THEN climb in towards the back where she wasn't getting wet. i always talked to her softly b/c I thought it was so cute.
pretty soon, i never went into the shower w/o her in the bathroom with me.
...but one day, she just started to bathe herself with me. ...not completely in the water of course! just kept her legs soaked.
when i started to take baths, she would JUMP on my shoulder as if I were some island. ...and then one day she got down to my knees, and the rest was history!!! I keep her out now. I don't like her being near bubble bath since I can never tell what will irritate a cat's skin.