"I'm back again," Burke said on "GMA." "This is my 20th season, and I'm just so happy to be back."
When asked what has changed since she began competing on "DWTS," Burke cited the level of competition and the creativity in dances.
"I couldn't do any of the routines I used to do back in season[s] 2 and 3," said Burke, who noted she still keeps in touch with Lachey and Smith. "Season 25 is going to just be bigger than ever."
Burke started dancing when she was 6 years old and began training in ballroom dancing at 10. She made headlines earlier this year when it was announced she would join the hit reality TV show "Dance Moms" as a guest choreographer after the show's star dance coach, Abby Lee Miller, was forced to leave because of legal woes.
Burke said she is looking forward to "changing it up" this season by featuring different types of choreography, including contemporary and jazz. She was coy when it came to sharing details of her celebrity partner, saying only, "He's a guy."
Drew Scott, a star of the home improvement reality TV show "Property Brothers," was the first celebrity to be revealed for the upcoming season of "DWTS." He is paired with pro dancer Emma Slater.
"We've actually done two rehearsals," Scott said on "GMA" last week. "I'm an athletic guy, I'm a sporty guy, and I like taking on a challenge, but I've never danced before."
See the other pro dancers lined up for the next season of "DWTS" here.