completed cross stitch

I don’t think there is a book of cross stitch patterns with celebrities in it but you can generally get a pattern of just about any celebrity. I have seen Marilyn Monroe, Elvis, Alan Jackson, I have even seen one of Clay Aiken, I have seen lots of celebrities. Herrshner’s and Lanarte often have Marilyn Monroe or Elvis designs.
Some home based businesses use a computer software program to make charts from photos, a lot of times you can find these businesses selling their charts on eBay. I would do a search on eBay for the celebrity name you are looking for plus the words “cross stitch” in the category of crafts. Or do a google search of the same.
If you can’t find it, you can probably find the computer software to make the chart yourself.