Aerosmith frontman Steven Tyler, 60, has checked himself into Las Encinas Hospital drug rehabilitation clinic — the place Dr. Drew practices — in Pasadena, Calif.

It’s the same facility where the reality show “Celebrity Rehab” was filmed. Tyler is getting treatment for substance abuse.

Tyler’s reps had no comment.

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George Michael is performing on tonight’s “Idol” finale, but he ain’t “the biggest star in the world” that Executive Producer Nigel Lythgoe has been touting — our spies tell us, it’s “Iron Man” Robert Downey Jr.

TMZ moles say the finale will include a virtual hologram of Gladys Knight singing “Midnight Train to Georgia” with Ben Stiller, Jack Black and Downey Jr. singing backup as the Pips. Holy Nat King Cole! “Idol” did this last season when Celine Dion sang along side a virtual undead Elvis. For the record, Gladys Knight is still alive.

We’re told the Jonas Brothers, ZZ Top, Seal, Bryan Adams, One Republic, Jordin Sparks and Carrie Underwood will also perform before David Archuleta (or possibly maybe, but not likely, Cook) is crowned the winner.

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