Katy Perry setup Luke Bryan on the set of American Idol by forcing him take his vitamins. Luke Bryan walked into the Idol set as normal and sees an IV drip next to his judge chair. He at first thought the IV was filled with urine but figured out it was actually his co-host, Katy Perry, trying to give him vitamins in the only way she knew how. The “Roar” singer jokingly said “You’ll taste it,” referring to the vitamins going in his veins. “That’s the B,” Fellow host Lionel Richie quipped jokingly referring to the vitamins going through Bryan’s bloodstream. The country singer had to sit through …