Ariana Grande sang a sexy duet with her boyfriend Big Sean at Jingle Ball in Los Angeles on Dec. 5, but she managed to outdo herself with another performance at KDWB’s annual Jingle Ball in St. Paul, Minnesota. There’s no stopping Ariana! Days after performing a holiday duet with her man at Jingle Ball on Dec. 5, the pop star traveled to Minnesota to sing “Bang Bang” with Jessie J, 26, and she looks sexier than ever. (No, seriously.) Dressed in a skimpy black corset, thigh-high platform boots and, of course, her signature cat ears, Ariana commanded the stage with her sultry presence and, as always, powerhouse voice. The singer, 21, has worn her cat ears to tons of events, but we’ve never seen her don a feline look this sexy before. Although Nicki Minaj, 32, wasn’t there to join the duo, Ariana and Jessie J killed it with their smash hit and were joined by other A-listers at the Xcel Energy Cente...