Film PR and celebrity PR are different activities, although the same PR agencies may handle both.
Celebrity PR involves the promotion of the client in a way that their image remains intact in the public eye. It also promises to keep the buzz around the client alive to garner media and audience attention. Celebrity PRs create noise about the personal lives of celebrities, their work, and the statements they make. This leads to publicity because the audience loves gossip.
Film PR creates a buzz about an upcoming film to ensure more business. Both film and celebrity PR involve active and reactive stories. Active stories are planned positive communication about the celebrity or the film, whereas reactive stories are made in response to any backlash or negative news.