Asked about recent rumors that the American Idol host was planning to propose, Hough, 22, tells Entertainment Tonight with a smile: "Well, that's news to me, and I think it's news to him."
The couple, linked since early summer, have kept their relationship very low-key. But Hough does reveal for ET, in an interview scheduled to air Wednesday, her favorite part of their July trip to Italy, when she and Seacrest, 35, were photographed smooching on his yacht.
"Eating, eating, eating, eating," the star of the upcoming Footloose remake says of the European jaunt. "I definitely had to get into shape for this movie after that little trip. But it was amazing."
Hough, a professional ballroom dancer, famously won two seasons of ABC's Dancing with the Stars.
The current season is a thrill for her, too, as she watches her brother Derek partner with Jennifer Grey.
"Growing up watching Dirty Dancing, she was a huge inspiration to me to be a dancer, to be an actress, to follow my dreams," Hough says. "And to watch her … and my brother dance, it was so emotional, very inspiring, and she just was beautiful and stunning. It was just really beautiful to watch."