"I'm making a cameo," says the 18-year-old, "so I'm so excited about that. I'm playing one of my own songs and just in the background of one of the scenes."
Although one of country's hottest new stars, Swift doesn't mind sharing the spotlight in the Disney feature. "I'm just like the bar band, which is kinda fun."
Expressing her anticipation, Swift adds, "I'm just really excited about it because it's really cool when some of my little fans will come up with a Hannah Montana shirt on, and I want to be like, 'Guess what? I get to be in that movie with her!' "
Swift, appearing on Monday's Today show, also spoke highly of her pal. "Miley Cyrus is awesome. I love her so much. She is so incredibly funny and sweet!" Swift gushed.
"It's fun to get to see her, because we both have been on the road constantly, and with us both in Nashville now, it will be cool to get to hang out with her."
Country group Rascal Flatts will also appear in the movie, which is set to hit theatres in 2009 and deals with Montana's taking a trip with her father to her Tennessee hometown, where she gains a perspective on her double life.