Ive just noticed my knees have gone very wrinkly!!

Is it due to my weight gain?!? so celulite?? or could it be something else!!
pre pregnancy my legs were my pride and joy lol!!! Spinning classes kept them shaped!!!
I excercise and am on my feet all day!?! could it be water retention!!!
Will I ever get my perfect pins back??
Just to prove pregnancy has hit me hard with the weight
My legs pre pregnancy

(with my friend on the left... who is ok about me postin a pic up of her)