Famous march birthday

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Across
  1. 4. Pop diva, born March 28, 1972. Singer known for 'Poker Face' and eccentric fashion.
  2. 5. Genius physicist, born March 14, 1879. Developed the theory of relativity.
  3. 6. Pop singer, born March 3, 1997. Former member of Fifth Harmony and solo artist behind 'Havana.
Down
  1. 1. Basketball legend, born March 6, 1972. Dominant NBA center and former Lakers star.
  2. 2. Pop star, born March 1, 1994. Canadian singer of 'Baby'.
  3. 3. Pop and R&B singer, born March 27, 1970. Known for her five-octave vocal range and 'All I Want for Christmas Is You.