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‘Arrested Development’ Season 4: Now With Conan O’Brien (Video)

Conan O'Brien and his trusty sidekick join the ever-growing cast of the revived cult favorite "Arrested Development"

"Arrested Development" is adding a splash of Coco to the mix for its upcoming fourth season.

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Talk-show host Conan O'Brien and his faithful sidekick Andy Richter will appear on the revived cult favorite, which will premiere on Netflix in spring 2013.

Also read: "Arrested Development" Offers 6 Walk-On Roles to Fans (Video)

"Arrested Development" star Will Arnett — who plays Gob Bluth on the show, which ran for three seasons on Fox from 2003 from 2006 — made the reveal while appearing on O'Brien's TBS show Tuesday night.

Also read: "Arrested Development" Could Get Extra Episodes for Season 4

“I don’t want to give away too much … but let me put it this way: There are a few people on this stage tonight who are a part of [the upcoming season],” Arnett told the pair. “And I think we know who we are.”

Richter has previously appeared on "Arrested Development," guest-starring in Season 3 as himself and his four identical siblings, a riff on Richter's former Fox sitcom, "Quintuplets."

The upcoming fourth season of "Arrested Development" — which was originally slated for 10 episodes but will likely receive more — has drawn a cavalcade of new and returning guest stars, including Henry Winkler, Liza Minnelli, "Mad Men" star John Slattery and "Three Stooges" actor Chris Diamantopoulos.

Watch Arnett, O'Brien and Richter talk about getting "Arrested": below.