"Pieper and Brendan have been dating for a few weeks now," a source told Us.
"Either he'll fly to New York and hang with her, or she'll fly to Boston to hang with him. She was most recently in Boston over Memorial Day weekend and they were even spotted out in public together."
Fans have spotted the new couple out in both cities recently, but Brendan and Pieper -- who have yet to post photos with each other on social media -- are reportedly trying to keep their romance hush-hush for now.
"They're keeping their relationship under wraps since they're trying to make it work long-distance and it's still new," the source explained.
"They both are super into each other and are getting to know each other and are just having fun going on dates."
Pieper, a 23-year-old model and graduate student, and Brendan, a 31-year-old commercial roofer and model, reportedly met because they "have mutual friends" and "hang out in the same Bachelor crowd."
Pieper was sent home by Matt on The Bachelor's 25th season, which aired earlier this year, at the Rose Ceremony which determined his Final 4 bachelorettes and the hometown-date recipients.
On The Women Tell All special, Pieper said she was shocked by her elimination and never saw it coming. She admitted to having a really "hard time" with the breakup because she was "definitely in love with Matt."
"By [my one-on-one date with Matt], I think I was in love with him and I think for me, the easiest thing to vocalize was, 'I am falling in love with you,' because that still kept one wall up... like, 'You can't have all of my happiness.' But I was 100 percent in," Pieper explained to Chris Harrison at the time.
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Pieper claimed she "really went for it" with Matt and left the show "absolutely heartbroken and soul crushed."
As for Brendan's time on The Bachelorette, he stuck around for Tayshia after Clare quit the show prematurely to pursue a relationship with her early frontrunner Dale Moss.
Brendan made it all the way to Tayshia's Final 3 bachelors but chose to quit the show before the overnight portion of his Fantasy Suite date because meeting with the show's jeweler Neil Lane apparently made the divorcee anxious about proposing marriage again.
Brendan said he was hesitant to pop the question to Tayshia because he wants his second engagement to turn into a marriage that will last forever.
"When I came here, I thought I was ready, and I knew I was ready in my own mind... I want a wife and kids and a family more than anything on the face of this earth," Brendan began.
"But I came to the realization there is a big part of me that's still broken. There's a big part of me that still needs time to heal. There's a big part of me that needs time to grow, because I still think there are pieces of myself that I need to pick up."
Brendan added on the verge of tears, "All I want is to give you my whole heart, but as I sit here today, my heart isn't whole... You deserve a man that is complete... and healed from his past. And unfortunately right now, I'm not that man. I'm so sorry."
Tayshia lamented in a confessional after Brendan left, "I really thought I was going to be with him. I really thought I was going to end up with Brendan."
Tayshia added, "He's been a person every single day I've been like, 'It's Brendan.' Every single day."