Rihanna and A$AP Rocky are still going strong.As we continue to see the couple grow closer, a source told PEOPLE that their connection has “evolved” from a friendship into a “solid romance.”“This romance evolved since they were friends first. They already knew and respected each other and it has just grown from there,” the music source explains, going on to say that their initial friendship allowed for them to “build a great foundation.”Rihanna and A$AP Rocky wore coordinating flaming hot