Who knew that Chris Brown and Ed Sheeran were such good friends?

Brown, 26, celebrated Labor Day weekend in Las Vegas, where he performed for a sold-out crowd at Drai's nightclub on Sunday.

During the show, Brown surprised the audience by bringing Sheeran, 24, on stage for a joint performance of their hits. With a drink in hand, Sheeran joined Brown for an a capella rendition of the latter's "Loyal" before busting out the full club version, which saw Sheeran rapping most of the lyrics and dancing.

Roberts grows up

Emma Roberts graces one of Glamour's three October covers celebrating the fall TV season. (Taraji P. Henson of "Empire" and Gina Rodriguez of "Jane the Virgin" are on the others.)

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Inside, former child star Roberts, 24, talked about how she's made the transition to more adult fare such as her role in the new Fox fall show "Scream Queens." "I think it happened naturally. Instead of trying to be like, 'Look how mature I am, I'm going to take off my clothes,' I pick roles based on what I love," she said. "I'm not picking roles based on what's going to prove to people that I'm older."

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