Conversation so far:
Was Tippi Hedren married?
In 1952, Tippi Hedren met and married 18-year-old future advertising executive Peter Griffith.
Did Tippi Hedren have any children?
Tippi Hedren's and Peter Griffith's daughter, actress Melanie Griffith, was born on August 9, 1957.

Question: When was their daughter born?
Self-contained rewrite: When was Tippi Hedren's daughter, Melanie Griffith born?