"After the Best Picture award has been given, Seth and Kristin will perform a special number and we think it will be a 'can't miss' moment," said producers Craig Zadan and Neil Meron.
The Academy has a stellar list of performers this year and Chenoweth will join names like Norah Jones, Jennifer Hudson, Catherine Zeta-Jones, Hugh Jackman, Russell Crowe, Anne Hathaway, Amanda Seyfried, Eddie Redmayne, Samantha Barks, Aaron Tveit and Helena Bonham Carter, Adele, Dame Shirley Bassey and Barbra Streisand.
The show producers have also roped in big names from Hollywood to present the golden statue to the winners.
Some of the presenters from the rather long-list include names like Meryl Streep, Jennifer Aniston, Michael Douglas, Jamie Foxx, John Travolta, Ben Affleck, Jessica Chastain, Jennifer Lawrence, Halle Berry, Sandra Bullock, Nicole Kidman, Reese Witherspoon, Mark Wahlberg and Oscar winners Jean Dujardin, Christopher Plummer and Octavia Spencer among others.
Oscars for outstanding film achievements of 2012 will be presented on Oscar Sunday, February 24, at the Dolby Theatre at Hollywood & Highland Centre. The ceremony will be hosted by Seth MacFarlane.