Originally Posted by Check

I'm done this a couple times before and I typically just call the hotel and tell them that she will be arriving before I am and checking in which I would assume accomplishes the same thing as adding an additional guest.

As long as you're not staying concurrently in a different Hilton property I can't imagine how they would ever be the wiser. What are they going to do, search the room at 3 AM to make sure you're in there?