Woody Allen is mourning the loss of Diane Keaton, who starred alongside him in the career-defining film "Annie Hall."

In an emotional essay for The Free Press, Allen, 89, remembered Keaton, whose death was confirmed Saturday, Oct. 11, at 79, as "charming," "magical," and "beautiful."

"Unlike anyone the planet has experienced or is unlikely to ever see again, her face and laugh illuminated any space she entered," wrote Allen, who shared both a romantic and creative relationship with Keaton for just under a decade. "I first laid eyes on her lanky beauty at an audition and thought, 'If Huckleberry Finn was a gorgeous young woman, he'd be Keaton.'"

Diane Keaton dies. The Oscar-winning 'Annie Hall' and 'Godfather' actress was 79.

Keaton appeared in eight of Allen's films and was widely regarded as his muse for a significant portion of the controversial director and writer's early success. She stood by him in later years, after Allen's star was tarnished by allegations that he molested his adopted daughter, Dylan Farrow, and after he married ex Mia Farrow's adopted daughter, Soon-Yi Previn.