Linda Bell Blue joined the venerable showbiz newsmag as executive producer in 1995, at the start of its 15th season. She will exit Entertainment Tonight in September 2014 after 19 years on the job, a source confirms to Deadline. Bell Blue also is leaving her EP post on the nightly newsmagazine omg! Insider. She now is eyeing a creative exec gig with CBS Television Distribution, which produces and distributes ET. D.J. Petroro, who joined ET in 2005 and is Bell Blue’s No. 2, will take over when she exits.