Why did I fire my Secretary?

This is a hilarious stuff i received. Read on-

As I walked into my office, my secretary, Janet, said, "Good morning Boss, Happy Birthday"
And I felt a little better; someone had remembered.
I worked until noon. Then, Janet knocked on my door and said "You know, it's such a beautiful day outside and it's your birthday . Let's go to lunch, just you and me." I said, "By George, that's the greatest thing I've heard all day. Let's go." We went to lunch. We didn't go where we normally go; we went out to the country to a little private place. We had two martinis and enjoyed lunch tremendously. On the way back to the office, she said, "You know, it's such a beautiful day. We don't need to go back to the office, do we?" I said,"No, I guess not." She said, "Let's go to my apartment." After arriving at her apartment , she said, "Boss, if you don't mind, I think I'll go into the bedroom and slip into something more comfortable."
"Sure," I excitedly replied. She went into the bedroom and, in about six minutes, came out carrying a big birthday cake, followed by my wife, children, and dozens of our friends, all singing Happy Birthday.
And there I sat...on the couch..........naked!!!