You may use any photo that could be obtained in a public area until the person in the photo ask you to remove it. You may also reproduce any photo taken by any photographer provided it wasn't a photo taken in a prearranged , private or of a contracted nature. The exception is when company trademarks or logos may appear in the photo and in those corporate law supersedes the above.
I work with a lot of media and run into copyrights quite a bit for images .
Quote from my lawyer in an email.
The copyright owner is the photographer and the image is fine celebrity wise as long as they didn't have a reasonable expectation of privacy. Don't use the photo without the photographer's permission or stipulations.