Although The Bachelor doesn't premiere until January 6, a promo was released on ABC of Hannah making a surprise visit to see Peter -- who finished in third place on her The Bachelorette edition -- while he was filming Season 24.
"I'm so confused right now. What are you doing here?" Peter, 28, asks Hannah in the preview clip, which aired on Dancing with the Stars' finale after Hannah took the stage and performed with her pro partner Alan Bersten.
"I'm making decisions for my heart, because I know there's still something there," Hannah, 25, replies. "And I would do anything for a relationship."
Hannah and Peter were sitting side-by-side on a couch in the clip, and their body language teased a potential reconciliation given Peter leaned in close to Hannah and nearly tried to kiss her.
Peter then proceeded to invite Hannah to join his lineup of bachelorettes competing for his heart.
"Hannah Brown, what I'm about to say is extremely crazy. What would you say if I asked you to come and be part of the house?" Peter asks Hannah as he rubs her back and she giggles.
Women were shown eavesdropping in on the conversation from a distance and yelling, "Oh my God!"
And in a second promo for the new The Bachelor season that aired later during the Dancing with the Stars broadcast -- which concluded with Hannah winning the mirrorball trophy over three other finalists -- Hannah stepped out of a limo at the show's Malibu mansion.
When Hannah appeared on Good Morning America Tuesday morning following her Dancing with the Stars victory, she dodged a question about whether she chose to compete on Peter's The Bachelor season.
"I don't know!" Hannah said with a big smile. "You're all going to have to see in January, but right now, I'm celebrating this [mirrorball trophy] right here!"
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According to Reality Steve spoiler blogger Steve Carbone, however, The Bachelor viewers shouldn't read into the promo of Hannah and Peter's reunion too much.
"B4 everyone freaks out when first promo airs tonight," Carbone tweeted on Monday before the DWTS finale began airing, "Hannah WAS NOT a contestant on Peters season."
"She gets out of the limo to talk to him night 1 (didn't join the party), & shows up on a date in ep 3 again to talk," he continued. "Both were in LA. She just took a couple hrs off DWTS to do it."
The Bachelor promo featuring Hannah and Peter's conversation also teased a lot of drama, physical intimacy and tears.
"I am so excited. I have no idea what's coming, but I know that my life will never be the same," Peter says, as he's about to take off in a plane.
Several bachelorettes then gushed about how "hot," "sexy" and "delicious" Peter is, and one woman called the airline pilot her "dream man."
After a few clips of Peter's romantic dates were teased, one woman could be heard saying she had "an undeniable connection" with Peter, before another bachelorette expressed she was "falling in love" with him.
Footage then flashed to Peter apparently showering with one of his ladies.
"You can't do these things with other women or I'm leaving," a woman demands.
"I don't want this just to feel like it's all about sex, but I have been intimate," admits Peter, who had sex with Hannah four times in a windmill during her The Bachelorette season. "I can't lie to you about that."
"I'm so done. It just hurts. It hurts really bad," a tearful bachelorette laments.
Peter then vents to the cameras, "I can't understand how she can give up. There's so much right now that's just destroying my heart."
Hannah admitted to People in July she was "in love with Peter" but her heart was pulling her in different directions on The Bachelorette's fifteenth season.
"But I had to make a decision," Hannah said at the time. "I felt like my heart was broken... What I'll miss most about Peter is his genuine love for me. The time we had together was real."
Peter's The Bachelor season began taping in September and wrapped earlier this month.
To find out more about Peter's bachelorettes, click here. And for spoilers on Peter's journey to find love and his Final 3 women, click here.