The couple wed Saturday evening at the Luxe Sunset Boulevard hotel in Los Angeles surrounded by 250 guests, Peoplereported.
"This was the best way to start the chapter of my life as Mrs. Young," DeGarmo told People on her big day. "I'm over the moon with joy and happiness about our wonderful wedding. I can't wait to spend my life with my husband!"
"Today was the best day of my life," Young explained. "Diana and I are in it forever. She's my best friend."
The bride reportedly wore a form-fitting gown by Sareh Nouri embellished with rhinestones and pearls.
"It was the first dress she tried on," said Renee Strauss, an LA-based luxury bridal expert who organized the wedding. "She knew immediately that it was the perfect dress for her."
The gown was adorned with her grandmother's pearls, which represented "something old," diamond earrings she "borrowed" from her engagement ring designer David Webb, and "something blue" -- a pair of bold cobalt cowboy boots, according to the magazine.
The groom reportedly sported a custom-made box suit which featured the couple's motto "Forever Young" on the inside, and the wedding was splashed with the colors yellow and purple.
"They wanted to put their personal touch on the wedding," added Strauss. "We all worked together to make sure every detail was special."
Young, 32, and DeGarmo, 25, reportedly exchanged vows they had written themselves and then celebrated their union with a reception complete with two wedding cakes and their first dance as man and wife to "I Do," an original song they had previously recorded together for the occasion.
Young was American Idol's seventh-place finisher during the show's fifth season, while DeGarmo finished Idol's third edition as the runner-up behind Fantasia Barrino.
(Photo credit Fox)
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