Hip-hop star Pharrell Williams was forced to apologize for his profanity-laden performance on the first night of Kanye West’s Glow In The Dark tour on Wednesday - after spotting a young child in the front row.

Williams’ band N.E.R.D. was the second act on the bill at Seattle, Washington’s Key Arena.

The group took to the stage with a high-energy show that featured Williams hurling out expletives during songs like Rock Star and She Wants To Move.

Williams returned to the stage while fans waited to see pop princess Rihanna to apologize for his use of profanity in front of a young child seated in the front row.