Nicki Minaj turned Vegas upside down last night when she stormed the stage on the second day of the iHeartRadio Music Festival at the MGM Grand Garden Arena. The HB rocked the crowd by performing a full set of her Pink Friday hits and a verse off her latest hit “Y.U. Mad.” I must say, this past year of constantly being on tour has definitely helped Nicki step her stage-performance game up! Check out pics and video footage after the jump!! Wendy L.