1915 - Anthony Quinn, Mexican-born actor (d. 2001)
1919 - Don Cornell, American singer (d. 2004)
1920 - Edmund Adamkiewicz, German footballer (d. 1991)
1920 - Ronald Magill, British actor (d. 2007)
1923 - John Mortimer, English barrister and writer
1925 - Sir Anthony Mason, former Chief Justice of Australia
1926 - Queen Elizabeth II of the United Kingdom
1926 - Arthur Rowley, English Footballer (d. 2002)
1927 - Gerald Flood, British actor (d. 1989)
1930 - Silvana Mangano, Italian actress (d. 1989)
1932 - Elaine May, American comedian
1935 - Charles Grodin, American actor
1935 - Thomas Kean, former Governor of New Jersey and 9/11 Commission Chairman
1936 - James Dobson, American evangelist
1938 - Ernie Maresca, American singer, songwriter and record executive
1939 - Helen Prejean, American writer
1944 - Adrian Hurley, Australian basketball coach
1945 - Diana Darvey, British actress, singer and dancer (d. 2000)
1947 - Iggy Pop, American musician (The Stooges)
1947 - John Weider, British rock musician (Eric Burdon and the Animals, Family)
1948 - Gary Condit, American politician
1948 - Paul Davis, American singer
1949 - Patti LuPone, American singer and actress
1951 - Tony Danza, American actor and comedian
1951 - Michael Hartley Freedman, American mathematician
1951 - Robert Gotobed, English drummer (Wire)
1951 - Steve Vickers, Canadian ice hockey player
1954 - James Morrison, American actor
1954 - Ebiet G. Ade, Indonesian singer
1956 - Phillip Longman, American demographer
1957 - Edward Leslie, American professional wrestler
1958 - Andie MacDowell, American actress
1958 - Michael Zarnock, American author/columnist/Guinness World Record Holder
1958 - Yoshito Usui, Japanese manga artist
1959 - Robert Smith, British musician (The Cure)
1959 - Jerry Only, American musician (The Misfits)
1959 - Michael Timmins, Canadian musician (Cowboy Junkies)
1960 - Michel Goulet, Canadian ice hockey player
1962 - Les Lancaster, American baseball player
1963 - Ken Caminiti, American baseball player (d. 2004)
1963 - Roy Dupuis, Canadian actor
1963 - John Cameron Mitchell, American film director
1964 - Alex Baumann, Canadian Olympic swimmer
1964 - Ludmila Engquist, Russian-born Swedish athlete
1965 - Ed Belfour, Canadian ice hockey player
1965 - Karen Foster, American model (Playboy)
1965 - Fiona Kelleghan, American academic/critic
1966 - Michael Franti, American musician
1969 - Robin Meade, American reporter
1970 - Glen Hansard, Irish song-writer/actor
1970 - Rob Riggle, American comedian
1970 - Nicole Sullivan, American actress
1971 - Alexander Kravchenko, Russian professional poker player
1971 - Michael Turner, American comic book artist
1972 - Gwendal Peizerat, French ice dancer
1972 - Severina Vu?kovi?, Croatian singer
1976 - Rommel Adducul, Filipino basketball player
1977 - Jamie Salé, Canadian figure skater
1977 - Doseone, American rapper
1978 - Jacob Burns, Australian footballer
1978 - Jukka Nevalainen, Finnish drummer (Nightwish)
1978 - Branden Steineckert, American drummer (Rancid, formerly of The Used)
1980 - Vincent Lecavalier, Canadian hockey player
1980 - Tony Romo, American football player
1981 - Stephanie Larimore, American model
1982 - Carnell "Cadillac" Williams, American football player
1983 - Pawe? Bro?ek, Polish footballer
1984 - Eric Devendorf, American basketball player
1986 - Audra Cohen, American tennis player
1986 - Alexander Edler, Swedish hockey player
1987 - Nadif Chowdhury, Bangladeshi cricketer
1988 - Robbie Amell, Canadian actor
1988 - Pedro Mosquera, Spanish footballer
2007 - Princess Isabella of Denmark
So to answer the question for April 21, YES!