Pop star Lady Gaga turned peacemaker for the day when she broke up a fight at her concert in Washington.

She was performing on her 'Monster Ball' world tour in Washington Tuesday night, when she noticed an altercation break out between two people in front of the stage and quickly halted the music.

'Stop fighting. Do not fight at this show,' femalefirst.co.uk quoted her as saying.

'Is she ok? Are they both ok? I don't know who hit who. I'm sorry. I just don't want you to fight. This is all about love and happiness,' she said.