Cardi B is twerking with joy — literally! The The 25-year-old rapper hit Instagram on Monday to share a series of videos as she celebrated becoming the first female rapper to land two number one singles atop the Billboard Hot 100 lists. A post shared by Cardi B Official IG (@iamcardib) on Jul 2, 2018 at 11:54am PDT Then she broke into a spontaneous twerk session as she continued to shout, "I'm number one.