Pharrell Williams Celebrates his 41st Birthday with Spongebob!

Posted Saturday April 5, 2014 8:47 AM GMT

He's always been a kid at heart, so it's no surprise that Pharrell Williams had a Spongebob Squarepants themed birthday party on Friday (April 4).

The "Happy" singer donned a black and yellow varsity jacket, jeans, and the green version of that infamous hat as he posed for pics on the yellow carpet.

Joining the hitmaker to celebrate his 41 years on the planet were guests including designer Alexander Wang, Swizz Beatz and Alicia Keys, photographer Terry Richardson, Q-Tip, and Soledad O'Brien.

It's a big weekend for Pharrell, as he's set to perform on "Saturday Night Live" with host Anna Kendrick.

Photo Credit: Wenn.com