During an interview with ET's Lauren Zima on Thursday, the former Bachelor -- and famous fence jumper -- said he's confident Brown will give viewers a season to rival the drama of his own.
"If anyone's going to be able to top the fence jump, it's going to be Hannah," he joked. "She's unfiltered, unapologetically herself, and I think it's going to be one of the most entertaining seasons."
Brown's season kicks off in just over a week, on May 13. Underwood and his girlfriend, Cassie Randolph, couldn't be more excited to have the Alabama native take the reigns, while they escape from the pressure of being the latest Bachelor couple -- and one without a ring.
"We realized going on that show, you put yourself into a position to have outside pressures or people immediately think you should be engaged ...I sort of fell into that trap early on," Underwood confessed. "I felt like I had to put a timeline on when we were going to get engaged because it was so abnormal, but I think for us, let's just be normal, let's enjoy dating each other."
"I think initially, coming off of it, honestly we felt the need to defend it," Randolph added of previously telling ET they might be engaged later this year. "Yes, we're at this stage, and we wanted everyone to believe how much we cared about each other, because we do, so much, and we thought that was how we'd go about it."
The couple -- who are promoting the app Tubi, which has The Bachelor, Bachelorette and Bachelor in Paradise available to stream now -- are happily just dating. They live close to each other in separate places in Los Angeles, and have discussed engagement and marriage, but aren't conforming to a timeline. Underwood and Randolph are, however, open to doing more reality TV.
"I'm not going to lie, I enjoyed filming three reality shows. She enjoyed filming hers prior to even coming on the Bachelor," Underwood said of his girlfriend's appearance on Young Once. "So, it's definitely on the table and something we probably would do, given the right circumstance."
"If anyone's going on DWTS, it's [Cassie]! In regards to another show, I don't know, we've had conversations about doing another show, we don't know exactly what it's going to be because we want to be very selective. Our relationship comes first so it has to make sense for us as a couple," he noted, adding that going into acting, like former Bachelor Nick Viall, isn't really up his alley.
"It's a skill and an art you develop over years. I wouldn't want to disrespect anybody who's worked on it," Underwood explained.
For Randolph, meanwhile, the future is all about continuing her education to become a speech pathologist. "School for me!" she shared.
See more on the couple in the video below, and join ET's Bachelor Nation Facebook group here.