Pharrell Williams to be a dad again - report

Pharrell Williams is set to become a second-time father.

The Happy star's wife Helen Lasichanh debuted what looked like a baby bump at a Chanel event to celebrate the company's new fragrance, eight years after the couple welcomed son Rocket Ayer to the world in 2008.

A source tells E! the couple has been planning for a second child for "a while".

In 2014, Pharrell opened up about the meaning of his son's name, revealing he and his wife wanted to give their son a strong name.

"In the same way the Indians named their children after a force or animal or element, we named him after a man-made machine that was meant to go up, meant to ascend," he told U.S. talk show host Oprah Winfrey.

"Metaphorically, it was because of, you know, Stevie Wonder's Rocket Love, Elton John's Rocket Man and Herbie Hancock's Rocket. All of my favourite musicians. And his middle name is not Man. It's Ayer after Roy Ayers."

Pharrell and Helen were together for several years before tying the knot.

"It's awesome," the Voice coach previously told Savannah Guthrie of his relationship with Lasichanh. "The bestie thing is awesome. Every night is like a sleepover."

However, the relationship didn't get off to an easy start.

"She didn't answer half of my text messages (at first)," he told Oprah. "Egotistically, no (that didn't intrigue me). I was like, 'Oh yeah?' because I had that kind of money and because I had that kind of reach, I thought I was entitled and I had learned that no, she has a boyfriend and she's not interested."

"I hurt her a lot in the very beginning once she was free and was available, because I had given her all of this attention but I wasn't ready to, like, let go (of his life as a bachelor)," he added. "I looked at my life and I was like, 'Man, I could keep doing this for another 10 years. Is that what I want to do?' And so I made a decision. And then we made a decision and just started dating."

The couple will celebrate its third wedding anniversary next month (Oct16).

Representatives for Pharrell have yet to comment on the baby news.