According to the Bureau of Engraving and Printing, "Currency notes bearing the portraits of well-known personalities, whether movie stars or religious figures, are for the most part found to be genuine United States currency."

"They have determined that this practice does not violate Federal statutes prohibiting defacement of currency as long as the paste-on photograph can be removed without damaging the original note."

"The Bureau of Engraving and Printing's position regarding this matter is that this and similar other treatments of United States currency are demeaning. This type of enterprise is not endorsed by officials at the Bureau of Engraving and Printing." (http://www.bep.treas.gov/document.cfm/18/104/5/44/98)