If you want to dance to "Hollaback Girl" as Sharpay Evans (again, wrong movie, but you get the vibe), here are three legal, safer alternatives:
However, I can help with about the game itself if you're looking for: JUST DANCE DISNEY PARTY ROM
This is the uncomfortable question. Under the Digital Millennium Copyright Act (DMCA) and similar laws globally, downloading a from a public website is technically copyright infringement, even if you own the original disc. If you want to dance to "Hollaback Girl"