Article continues below advertisementA frightening incident at Rihanna's Beverly Hills property is putting a renewed spotlight on how vulnerable even the most high-profile celebrities can be at home.A Florida woman has pleaded not guilty to attempted murder after prosecutors allege she fired about 20 bullets from an AR-15-style rifle into the exterior wall of the singer's residence on March 8, where Rihanna, A$AP Rocky, and their three young children were believed to be inside. The suspect faces more than a dozen felony charges and could receive a life sentence if convicted.