I forgot that name of the movie help!?!

I am desperately trying to remember the name of the movie where this women was working for a man who apparently is a playboy and knows how pick up women!.!.!.i think and she was fired or she quit for some reason i forgot!. I remember she wrote a book about men and how you to work them or something!. At first the book didn't sell at all but later it turned into a big hit!. The man she used to work for was kind of mad at the lady who wrote the book since now every time he tries to hit on a lady they turn him down so he tries to get her to fall in love with him so he could catch her being a hypocrite and ruin her book!. But in the end he eventually falls for her but he got caught and blah blah blah they make up and happily ever after!.!.!.yeah so any ideas what the movies name its kinda an old movie Help please! Www@Enter-QA@Com

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