Jodie Marsh -
She's been into it for a while - has a series of vids on youtube http://www.youtube.com/watch?v=K-mLQh_VQ2w
She may have been training for that comp for just 50 days but there's loads of photos floating around from 2 years ago when she actually first started training. She had some definition then, but nothing of that level.
Edit: Found the article. Hope it's ok to post this :
daily mail article from May 2009
Also says here that she's gone from a size 10/12 to a size 6/8 which it says has just happened again in those most recent articles!
Its good that she has put some effort into doing something other than being a drunk Z celeb falling out of night clubs and having reality tv shows but just shows how many celebs have zero talent.
Anyone can do that, just takes time, money and dedication.