Rianna, the daughter of singer Rihanna, has been featured on the cover of W magazine's Pop Issue with her daughter, Rocki, 7 months old. The magazine also featured several musicians, including Pharrell, Mariah Carey, and Jonah Hill, who worked with Rihanna on the 2013 film "This Is the End". The magazine's cover girl is now 38 and has been named by W.