No other details were available.
Morissette, whose songs include "Ironic" and "You Oughta Know," has won several Grammys, including album of the year for 1995's "Jagged Little Pill."
She also earned a Golden Globe nomination for best original motion picture song for "Wunderkind" from "The Chronicles of Narnia: The Lion, the Witch and the Wardrobe," and appeared as God in Kevin Smith's 1999 film "Dogma."
She had been previously been engaged to actor Ryan Reynolds.