He's the rapper with a star turn in Hollywood's hottest franchise. She's the supermodel-slash-'Lip Sync Battle' star with a Grammy Award-winning husband. Together, they're running the 2015 BBMAs.

"Chrissy Teigen is already my new best friend!" Ludacris is speaking into his iPhone, ­narrating a behind-the-scenes clip of Billboard's cover shoot for his 3.8 million Instagram followers. He has just captured Teigen -- his 2015 Billboard Music Awards co-host, the hilariously blunt supermodel and wife of John Legend -- as a stylist adjusts the hemline of her black dress. The two have met only a few times before this afternoon in New York, but the rapport between Luda, 37, and Teigen, 29, is easy, playful -- even rambunctious.

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