Yes, everyone knows that Pharrell Williams was a producer before he started getting us all dancing with "Happy,"  but you may be shocked to know that he had a hand in some of the biggest songs of the '90s and early 2000s. As one half of the hit-making producing duo The Neptunes, Pharrell wrote and produced songs for artists like Gwen Stefani , Britney Spears , Justin Timberlake , and Jay Z. Keep reading to see some of the biggest hits that you may have forgotten Pharrell had a hand in making and, if you are really in a Pharrell mood, check out things you may not have known about the musician and producer .
Source: Getty / Bradley Kanaris 
Wreckx-n-Effect — "Rump Shaker"
Pharrell got his start in 1992, when he helped pen a verse for this classic '90s jam.
Britney Spears — "I'm a Slave 4 U"
In 2004, Pharrell and his Neptunes partner, Chad Hugo, wrote and produced this track.
Nelly — "Hot in Herre"
Pharrell cowrote and produced this 2002 classic party song with The Neptunes.
Ma$e — "Lookin' at Me"
Pharrell and The Neptunes hit it big when they cowrote and produced this 1998 single.
Mystikal — "Shake Ya Ass"
As part of The Neptunes, Pharrell cowrote, produced, and sang (although he was uncredited at the time) in this 2000 megahit. The song was later reedited to "Shake It Fast" to be more radio-friendly.
Gwen Stefani — "Hollaback Girl"
The Neptunes cowrote Gwen's breakout solo hit in 2005. The two had previously worked with Gwen and No Doubt for the 2001 single "Hella Good."
Ol' Dirty Bastard — "Got Your Money"
In 2000, The Neptunes produced Ol' Dirty Bastard's solo hit. The song featured a chorus sung by Kelis, who frequently worked with Pharrell.
Kelis — "Milkshake"
Pharrell and The Neptunes had been longtime collaborators with Kelis before she hit it big in 2003 with "Milkshake," which the duo cowrote and produced.
Usher — "U Don't Have to Call"
Pharrell earned his solo writing stripes when he penned Usher 's infectious 2001 jam. The song was also produced by The Neptunes.
*NSYNC — "Girlfriend"
The Neptunes cowrote and produced *NSYNC's 2002 hit, paving the way for the producing group's collaboration with Justin Timberlake .
Justin Timberlake — "Rock Your Body"
Pharrell and The Neptunes scored another massive hit in 2003, when they cowrote and produced this hit for Justin's debut solo album. The Neptunes also worked with Justin on "Like I Love You" and "Señorita" from that album.
LL Cool J — "Luv U Better"
Pharrell cowrote and helped produce LL Cool J's 2002 hit.
Jay Z — "I Just Wanna Love U (Give It 2 Me)"
Pharrell sang the chorus for, cowrote, and produced (with The Neptunes) Jay Z's 2000 hit. Strangely, Pharrell wasn't featured in the music video.
Ludacris — "Money Maker"
Pharrell cowrote, produced (with The Neptunes), and sang in this 2006 jam, which won the Grammy for best rap song in 2007.
Snoop Dogg — "Drop It Like It's Hot"
In 2004, Pharrell became a recognizable face when he was featured in Snoop's hit single, which he also cowrote and produced with The Neptunes. The song remained his biggest hit until 2013, when Daft Punk's "Get Lucky" and Robin Thicke's "Blurred Lines" topped the charts.