"That's news to me. And I think it's news to him," the country singer and former Dancing with the Stars professional dancer told Entertainment Tonight during Wednesday night's broadcast of the syndicated entertainment news program.
AOL's Popeater website had reported the couple -- who have yet to openly confirm their relationship -- were on the verge of getting engaged late last month.
"Ryan's parents adore her," a source told the website. "She is smart, beautiful and funny but even more important, she has made their son happy. Now, they are just waiting for him to pop the question. Which could be any day now."
"Every day I like her more and more," DeGeneres told Seacrest about her wife Portia de Rossi during the appearance.
"I love that feeling and I know what that feeling might be like, and we'll talk about that when we have dinner," the Idol host replied.
"I know, I'm excited for you!" DeGeneres said.
"Can we talk about it now?" interjected On-Air co-host Ellen K.
"Nope!" Seacrest said.
"Does everybody know, Ryan?" DeGeneres asked.
"No," he replied.
"Yeah they do!" Ellen K said.
"No!" Seacrest replied.
"Everybody does," Ellen K insisted.
"No, they don't. I have not talked about it," Seacrest repeated.
"Are there pictures?" DeGeneres asked.
"Yes. Everywhere!" Ellen K said before Seacrest changed the topic.
Rumors that Seacrest and Hough have been dating have swirled since this spring when Simon Cowell reportedly revealed the 35-year-old Idol host had recently gone on a date with "the girl from Dancing With the Stars" during an April interview with Fox's KTTV-TV affiliate in Los Angeles, CA.
While Hough initially claimed that she and Seacrest had only met with their managers for business, the pair have been spotted in public numerous times afterward, resulting in the 22-year-old -- who last appeared on Dancing with the Stars when she was paired with former boyfriend Chuck Wicks during the show's Spring 2009 season -- changing tactics and declining to comment on the relationship.