Pharrell Williams weds Helen Lasichanh

Pharrell Williams has tied the knot with his longtime girlfriend Helen Lasichanh.

Usher and Busta Rhymes attended the wedding ceremony and also put on a mini-concert for the newlyweds, Radar Online reported.

Robin Thicke, whose hit track 'Blurred Lines' was co-written and produced by Williams, was not present at the wedding.

Williams and Lasichanh have a son together.