TVLine Items: Idol Faves Join Finale, 'Welcome to Hulu, The O.C.' and More

American Idol Series Finale

Before crowning its final champion, American Idol will welcome back two of its most successful victors.

Kelly Clarkson and Carrie Underwood are set to perform on Idol’s series finale, airing Thursday, April 7, at 8/7c. The divas will take the stage as part of Fox’s three-night Grand Finale event, beginning with the 90-minute retrospective American Idol: American Dream on Tuesday, April 5, at 8 pm.

The last-ever performance show will then air April 6 at 8 pm, leading up to Idol‘s swan song the following night. In addition to Clarkson and Underwood, a whole slew of Idol alumni will return for the series finale, including Season 6 standout — and our own Michael Slezak’s Reality Check co-host — Melinda Doolittle.

Also confirmed for the final episode (deep breath!): Ruben Studdard, Fantasia, Taylor Hicks, Jordin Sparks, David Cook, Kris Allen, Lee DeWyze, Scotty McCreery, Candice Glover, Caleb Johnson, Nick Fradiani, Ace Young, Allison Iraheta, Amber Holcomb, Blake Lewis, Bo Bice, Brandon Rogers, Bucky Covington, Carly Smithson, Casey James, Chris Daughtry, Clark Beckham, Clay Aiken, Colton Dixon, Constantine Maroulis, Danny Gokey, Diana DeGarmo, Elliott Yamin, George Huff, James Durbin, Jessica Sanchez, Josh Gracin, Joshua Ledet, Justin Guarini, Katharine McPhee, Kellie Pickler, Kimberley Locke, Kree Harrison, LaToya London, Lauren Alaina, Pia Toscano, Sanjaya, Skylar Laine and Tamyra Gray — with more to come.

Ready for more of today’s newsy nuggets? Well…

* As part of a new deal with Warner Bros. TV, Hulu will begin streaming The O.C. in April, while Southland, Smallville and Rizzoli & Isles will become available later this year.

* Season 2 of PlayStation’s comic-book drama Powers will premiere Tuesday, May 31. The first three episodes will become available at noon PT, with subsequent episodes released every Tuesday thereafter.

* Starz announced Thursday that The Dresser — its TV-movie adaptation of Ronald Harwood’s play, starring Sir Ian McKellen and Sir Anthony Hopkins — will premiere Monday, May 30, at 9/8c. Watch a trailer below: