Pharrell Williams is certainly in a 'Happy’ mood today (April 5). Why? Today is 41st birthday! The veteran producer celebrated his born day with his celebrity friends and SpongeBob SquarePants in New York on Friday (April 4).

With the help of Nickelodeon, Williams partied the night away at NYC’s Cipriani Wall Street, which was transformed into the underwater city of Bikini Bottom.

Among the partygoers at P's B-Day bash include Alicia Keys and her hubby, Swizz Beatz, Russell Simmons and Soledad O’Brien. Hip-hopper Q-Tip was on duty as the event's DJ.

Skateboard P was also serenaded with a special birthday song from SpongeBob and the gang. He also received a huge custom-made birthday cake in the shape of Krabby Patty.

"Thank you @officialnicktv for throwing me a birthday party last night," wrote Pharrell on his Instagram page.

Happy Birthday, Skateboard P!

Dimitrios Kambouris, Getty Images
Dimitrios Kambouris, Getty Images
Dimitrios Kambouris, Getty Images
Dimitrios Kambouris, Getty Images