Phillip Phillips
wasn't the only one who got a great surprise on the "American Idol" finale on Wednesday night.

During the live show, Ryan Seacrest pulled former contestant Ace Young and girlfriend/fellow former contestant Diana DeGarmo on stage ... where, to Diana's surprise, Ace proposed!

"This has always been home to us and I felt that this would be the perfect place to ask a simple question," Young said before getting down on one knee.

"I love you to death, you're my best friend, I wanna make this last forever," he added before asking her if she'd marry him.

Diana, of course, said "Yes."

"Wow babe you picked a good one," DeGarmo said of the ring. "My makeups running!"

Congrats to happy couple!

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