01/26/2009 at 04:15 PM EST
's role on CBS's hit CSI: Crime Scene Investigation
hasn't aired yet – but the singer is already saying it's a part for the ages.
"When I'm really old and can only remember one story about my life to go back and relive," Swfit writes on her MySpace Celebrity blog
, "and tell over and over and over again to the point where my grandchildren roll their eyes and leave the room – that's the story."
Calling the experience "life-changing," she continues, "Ah, I can see it now. 'You know, when I was a youngster, I got to guest star on CSI
!' It was marvelous! So marvelous, it was!"
Swift, 19, will play a teenage girl whose family runs a motel in Las Vegas. No air date has been confirmed for her guest appearance.
In her humorous blog post, the singer reveals another life changing event: Her bathroom is now clean – thanks to her mother's hard work!
"My bathroom has stayed the same terrible mess of piled up beauty products for two years while I traveled the world with the sad, unorganized state of my bathroom perpetually weighing in the back of my conscience," Swift writes. "Then suddenly... EVERYTHING changed."
Continues the post: "I came back from L.A. and discovered a whole new world. My bathroom is now a magical, wondrous place with cabinets for storing makeup and hooks on the door for holding scarves."
Inside Taylor's pretty in pink 18th birthday party!
Take a peek inside Taylor's bedroom!