HOLLYWOOD (ET/CBS) – James Durbin impressed Steven Tyler so much with his rendition of Bon Jovi’s “I’ll Be There For You” on “American Idol” Wednesday night that Tyler struck a deal of a lifetime for the aspiring rocker.

VIDEO: Steven Tyler’s Promise

READ MORE: 49ers Win Wild Card 23-17 as Time Runs Out for Cowboys in Frantic Finish

“I don’t want to spoil the Aerosmith until the finale,” said Durbin after Tyler gushed about his spirited performance.

“You save it and I’ll come up and sing it with you,” Tyler quickly replied.

READ MORE: 1 Killed, 2 Injured in Sonoma County Crash on Route 116

To seal the deal, the Santa Cruz native approached the dais and shook Tyler’s hand.

Keep watching “American Idol” Wednesday and Thursday nights on FOX to see if Tyler makes good on his promise.

MORE NEWS: French Bulldog Stolen at Gunpoint During Castro Valley Armed Robbery

(© 2011 CBS Studios Inc. All Rights Reserved.)