Roberts and Spencer are the co-anchors of the network's "Good Morning America" program.
Cagle is a "GMA" contributor and editorial director of People and Entertainment Weekly magazines, and Beckford is a model and actor.
"The Oscars Red Carpet Live" program is to air March 2 at 7 p.m. ET.
Ellen DeGeneres is to serve as host of the event, which will honor the best in film for 2013.