iHeart Fest guests, presenters

A CAST OF THOUSANDS: We’ve given you the latest list of performers for this weekend’s iHeartRadio Music Festival, but wait, there’s more—much more. Among the celebs scheduled to be on hand are Fergie, Hilary Duff, Nick Jonas, Jamie Foxx, Chris Pratt, Craig Robinson, Johnny Galecki of Big Bang Theory, Sophia Bush, SNL’s Cecily Strong, Adam Devine, Janel Parrish, Randy Couture, Karina Smirnoff and Val Chmerkovskiy of Dancing With the Stars, and Orange Is the New Black’s Taryn Manning, Laverne Cox, Pablo Schreiber and Dascha Polanco. Guest presenters from various series on The CW include Gina Rodriguez (Jane the Virgin), Colton Haynes (Arrow), Phoebe Tonkin (The Originals) and Adelaide Kane (Reign). iHeartMedia's Elvis Duran, Ellen K, Nikki Sixx, Bobby Bones, Amy Brown, The Breakfast Club, Kane, Romeo, Nessa, Cody Alan, Johnjay and Rich, Mario Lopez and Jenn Marino will also make special guest appearances. All of the above have pledged to adhere to the dictum, what happens in Vegas stays in Vegas. (9/17p)