When the regular DJ called in sick, Sullivan put him on the air for the very first show of his broadcasting career.
In August 2005, it was announced that Seacrest would become executive producer and co-host of ABC's Dick Clark's New Year's Rockin' Eve.
On December 31, 2005, Seacrest performed much of the show's hosting duties.
In February 2004, Seacrest became host of Los Angeles radio station KIIS's morning show, replacing long-time host Rick Dees. announced a three-year, $21 million deal for Seacrest to host and produce various programs, including E! Seacrest produces the hit series Keeping Up with the Kardashians, the highest-rated show on the E!
network, and the spin-offs Khloe and Lamar, Kourtney and Kim Take New York and Kourtney and Khloe Take Miami.
American Idol went on to success, putting Seacrest in the national spotlight. When the show increased in popularity, seen by some 26 million viewers weekly, Seacrest became recognizable around the world.