Williams, who starred on The Voice as a coach for its seventh season and is set to return for Season 8, won three Grammy awards. He won Best Pop Solo Performance for "Happy," Best Urban Contemporary Album for G I R L and Best Music Video for "Happy."
In the Best Pop Solo Performance category, Williams beat out "All of Me" by John Legend, "Chandelier" by Sia, "Stay With Me" by Sam Smith, and "Shake It Off" by The Voice's former universal mentor Taylor Swift.
The following artists and their albums lost to Williams in the Best Urban Contemporary Album category: Jhene Aiko with Sail Out, Beyonce with Beyonce, Chris Brown with X, and Mali Music with Mali Is.
Best Music Video's other nominees were "We Exist" by Arcade Fire, "Turn Down for What" by DJ Snake & Lil Jon, "Chandelier" by Sia, and "The Golden Age" by Woodkid featuring Max Richter.
Lambert won Best Country Album with Platinum. Lambert is a former first-season Nashville Star finalist and she also previously advised Shakira's team on The Voice.
Aguilera won Best Pop Duo/Group Performance with A Great Big World for their hit song "Say Something." Aguilera is returning to The Voice as a coach next season after serving as an original coach and then appearing on the show on and off.