Bryan was revealed as the winner of a public vote against fellow hopefuls Carson Kressley and Kyle Massey on Good Morning America on Monday (August 27).
"I am so excited. I'm getting teary-eyed just right now," Bryan commented after the vote results were revealed, adding: "It was a fight… we all three really wanted it. I'm the lucky one with some amazing, incredible fans that have really stuck behind me."
She continued: "For me, it's just incredible to have a second chance for my fans. They were just so supportive from the beginning to just stick behind me and rally the troops.
"This is all about them. I am so lucky. I feel like the stars are aligning and I get a second chance."
"This is the first season I can knock myself out as a dancer, as a choreographer because she's so good," van Amstel vowed.
Bryan competed on the fifth season of Dancing with the Stars, ultimately being eliminated sixth with partner Mark Ballas.
Bristol Palin, Kirstie Alley, Apolo Anton Ohno, Pamela Anderson, Kelly Monaco and Gilles Marini are among the celebrities who will compete to become the ultimate Mirror Ball champion this fall.
Dancing with the Stars: All-Stars will premiere on September 24 on ABC.