Miley Cyrus was born --- November 23rd 1992.
Birth Name -- Destiny Hope Cyrus
And why do we call her Miley? Because, her parents thought she was so "smiley" that they called her Miley. And when Miley was about 15 years old; she legally changed her name to Miley Ray Cyrus. Billy Ray Cyrus, being Miley's father, is what got Miley her career started. She lately just starred in "The Last Song" (movie) as Ronnie (main character). Miley has also played in "Bolt" as "Penny". Wish you well Miley:)