Joe Otterson TV ReporterSara Bareilles has been cast in a lead role of the upcoming Tina Fey-Robert Carlock produced Peacock comedy series “Girls5eva.”In the series, when a one-hit-wonder girl group from the 90’s gets sampled by a young rapper, its members reunite to give their pop star dreams one more shot.Bareilles will star as Dawn, a former member of Girls5eva, who is now a bit restless in life managing her family’s small Italian restaurant in Queens.