Pop star Miley Cyrus and model Patrick Schwarzenegger, son of actor and former California Gov. Arnold Schwarzenegger and broadcast journalist Maria Shriver, reportedly are on a break in their relationship. E! News said Monday that after five months of dating, Cyrus, 22, and Schwarzenegger, 21, were choosing to take time off from each other. The move comes after photos surfaced showing Schwarzenegger and another girl during his vacation to Cabo San Lucas, Mexico, in March. "Omg. It's one of my best friends girlfriend . . . " he tweeted after the images from his spring break surfaced. "Would NEVER do anything against my GF. . . . Girls have guy friends and guys have friends that are girls . . . " Schwarzenegger was also photographed hanging out with an ex-girlfriend during that Mexico trip. Representatives for Cyrus and Schwarzenegger did not respond to Newsday's request for comment.