Jennifer Lopez may play a detective on Shades of Blue, but she reportedly turned to a real-life private eye to snoop on new boyfriend Alex Rodriguez earlier this year. Us Weekly reports that J-Lo employed a private investigator to tail A-Rod after The National Enquirer published allegations that he was cheating on her with his former mistress, Lauren Hunter. "She's really into Alex and wants it to work," says a source. "So she's trying to control as much as she can." However, she apparently couldn't control A-Rod's reaction when he discovered what she'd done. "He found out and they had a huge fight," adds the insider. "But they're working through it."