Poli:
Angelica gave you the real answer.
Now, we people choose to say it differently, then it isn't grammar.
Angelica gave you the grammatical correct way to say it.
When you talk about prescriptive and descriptive grammar, there isn't any such thing.
For instance, the law says that you should not kill, well that doesn't prevent people from doing it, right?
Is is correct because a lot of people kill?
Is it even acceptable that a lot of people kill?
I am a bit extremist, or radical if you will, but to me grammar is the law. If I chose to not abide by it, then it is my problem, but I try not to justify it arguing that many people use it and it is even accepted by lots of people.
it is my POV anyway.