You may not know any real celebrities (I don’t either).
But you no doubt know another type of “celebrity,” such as the CEO, President or SVP of a company where you worked, or a senior executive who could vouch for you.
These are your celebrities.
Ask them to provide a short sentence or two about your ability and character and use it as a third-party endorsement. You can use the quote in an addendum to your resume or in cover letters. (You may want to make it easy by offering to draft the short testimonial so they can do the final editing.)