Happy Halloween! The holiday provides a chance for celebrities to put on their costumes, and once in a while, those getups are actually the guises of other well-known stars. Miley Cyrus's MTV Video Music Awards performance has been a hit this year, with both Paris Hilton and Crystal Harris putting their spin on the queen of twerking's controversial look. Meanwhile, Matt Lauer went for a Pamela Anderson look on the Today show this year, Miley channeled Lil' Kim, and Chord Overstreet looked like an exact replica of Charlie Hunnam from Sons of Anarchy. Click through to see all the celebrities dressed as celebs on Halloween over the years!