The wedding took place at The Marigny Opera House in New Orleans on Saturday evening, People reported.
About 190 people attended the wedding, including celebrities Cameron Diaz, Eva Longoria, Kate Bosworth, Rob Corddry, Katie Aselton, Mark Duplass, Malcolm Gladwell, Lindsay Sloane, Erinn Hayes, Tig Notaro, Fred Melamed and Rob Huebel.
Bell, 34, and Campbell, 36, met in 2011 on the set of Bell's HBO show "How to Make It in America" and got engaged on Bell's birthday in March 2012.
Britney Spears on kissing Ryan Gosling, Justin Timberlake in the Mickey Mouse Club
Texas principal bans speaking Spanish, stirs controversy