Jennette and Ariana are sick of each other!

Are these two Sam and Cat stars fighting behind the scenes? Nope! Gossipers say Jennette McCurdy and Ariana Grande are secret frenemies, but the girls confirm to Tiger Beat that's just not true. "Jennette is one of my closest friends," Ariana spills to us. Ariana and Jennette are super close and spend time together both on and off the Sam and Cat set. Insider secret: Ariana sometimes calls Jennette "My Netty." The girls love having sleepovers to each other's houses, goofing off in web chats online with fans and gossiping about cute boys.