Kevin Hart and Nick Cannon are engaged in a friendly game of prank wars. For Kevin’s birthday, Nick gave him a llama. Kevin paid him back by publishing his phone number on billboards in Los Angeles, New York City, and Atlanta with the caption, “For any advice on fatherhood? Call my best friend, Nick Cannon.” The father of seven took the situation in stride. He even tweeted a picture of someone who actually FaceTimed him. Then he said, “I’m trying to keep it real and stay solid and not change my phone number but when you have friends like [Kevin], who needs enemies!!!?”