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Wedding day jitters? Not for Ace Young and Diana DeGarmo!

The American Idol alums are spending the last few days before their wedding calmly putting the finishing touches on their guest list.

Why so down to the wire? "People calling last minute and being like 'Oh, I changed my mind!" Diana says.

Which explains why the happy couple keeps having to swap around table placement at the reception. But all ends well.

"It's been very challenging but we have only about four people that need to confirm," says Ace. "Looks like the only thing left to do now is say 'I do!"

Tune in to E! News for full Diana and Ace wedding coverage from Tuesday, May 28, till Monday, June 3, at 7 p.m. and 11:30 p.m.