On December 29, 2005, it was announced that she would be joining Adam Carolla's new radio show in January 2006. On March 22, 2006, the show announced that Perry was absent, earlier in the week, to work on a television pilot. (The pilot was a show called Beyond, a drama based on NASA's Jet Propulsion Laboratory.) What was initially announced as a short absence grew into several weeks, during which the show featured several guests filling her role on the show. On May 1, Adam announced that Rachel had been let go from the show and was replaced, permanently, by Teresa Strasser on May 8, 2006. Adam has referred to Rachel as "a guest who wouldn't leave", during the Adam Carolla Show's First Annual Ace Awards's Worst Guest category on December 14, 2006.

In the meantime, Perry is also the host of VH1 Radio Network's Weekly Rewind radio program, heard on top stations around the country and distributed by Westwood One. She had also done "content wrap" spots for The CW's "c-what's happening" commercial segments, but they have seemed to be discontinued after a number of weeks.