Hot to make iOS FBSDKProfilePictureView Round

I'm trying to making a FBSDKProfilePictureView rounded but I can't.

This what I have:

ViewController.h

@property (weak, nonatomic) IBOutlet FBSDKProfilePictureView *fbPhoto;

ViewController.m on ViewDidLoad

self.fbPhoto.layer.cornerRadius = 30.0;
self.fbPhoto.layer.borderColor = [UIColor lightGrayColor].CGColor;
self.fbPhoto.layer.borderWidth = 1.0;

It makes a round circle in front of the UIIMage but it doesn't "crop" the image.

How can i do it