To dream of a celebrity endorsement may reflect your attempt to convince yourself to do something that you feel is more important than anything else in your life right now. You or someone else that is trying to convince others that something is more of a priority than anything else.
Example: A man dreamed of seeing a celebrity endorsement. In waking life he was telling himself that screwing his greedy deadbeat friend over in business the most important thing he needed to do in life in order to get money back that he generously gave him. He kept telling himself that it was single most important thing he had to do in order to get his life back to normal.