A woman was arrested Sunday after allegedly firing several shots with a rifle at the LA mansion of pop star Rihanna, with one bullet piercing a wall of the home, a law enforcement source told The Post.

Authorities are working to determine a motive. A source told The Post that Rihanna and partner A$AP Rocky “don’t know much” and they’re in the dark as to why this happened.

Photos from the scene showed yellow police tape outside the singer’s home. LAPD officers were also seen closing off the street near the star’s property.