Happy Birthday To "Harry Potter" actress Emma Watson (1990), "Snakes on a Plane" actor Flex Alexander (1970), Radiohead guitarist Ed O'Brien (1968), The Darkness bassist Frankie Poullain (1967), 4 Non Blondes singer Linda Perry (1965), "Back To The Future" trilogy's 'Biff Tannen' actor Thomas F. Wilson (1959), "Harry Potter and the Prisoner of Azkaban" actress Emma Thompson (1959), film composer Michael Kamen (1948; d. 2003), Welsh blues rocker Dave Edmunds (1944), film and TV actor Robert Walker Jr. (1940), "Bewitched" star Elizabeth Montgomery (1933; d. 1995), country music/Hee-Haw host Roy Clark (1933), actor Hans Conreid (1917; d. 1982), blues singer Bessie Smith (1894; d. 1937), and Italian Renaissance artist Leonardo (1452; d. 1519).