The 29-year-old singer shared a pic on Instagram taken with Bieber, 21, at Monday's Met Gala in New York, and praised the teen heartthrob.
"He really has a sweetness to him. He grew up in front of the whole world. I reminded him to not get bothered. Because at the end of the day. He's the boss, and life isn't always Roses. Lots of thorns," she wrote.