US President Barack Obama shared a powerful message, urging Americans to end violence against women and girls, when he made a video appearance during the 57th edition of the Grammy Awards here Sunday night.

 

 In the video, he said: "It's not OK, and it has to stop."

 

 Obama also asked artists to tell their fans to join "It's On Us", which is White House's ongoing campaign to help put an end to sexual assault on college campuses.

 

 "Artists have a unique power to change minds and attitudes and get us talking about what matters," he said.

 

 Following the powerful video message, domestic abuse survivor Brooke Axtell shared her painful experience.

 

 Then Katy Perry, dressed in a white gown with a cape, took to the stage to sing "By the grace of god".

 

 Hosted by rapper LL Cool J, the ceremony was attended by stars like Taylor Swift, Enrique Iglesias, Lady Gaga, Nicole Kidman and Paul McCartney.