Taylor Swift's Keeping Her Birthday Plans a Secret

So how will Taylor Swift be celebrating her big 21st birthday today?

OK! GALLERY: HAPPY 21ST BIRTHDAY, TAYLOR SWIFT!

"Plans? For my birthday? This is it! This was all I planned for," Taylor said when she spoke to Nashville DJ Gerry House on WSIX this morning. "It snowed yesterday, you know, so that kind of limits activities. I may sit inside my apartment and pretend I'm in a snow globe."

But really, Taylor isn't treating her 21st like she's that much older than she was before!

"I don't feel older all of a sudden," she explained. "It's a state of mind thing, how you see the world, being excitable, staying excitable and impressionable and doing your best not to become jaded or bitter. I think keeping your mind and your heart open keeps you young."

OK! NEWS: TAYLOR SWIFT & JAKE GYLLENHAAL KEEP UP THE COFFEE DATES

Does Taylor feel overwhelmed at all by her success right now?

“Things feel really good on this birthday, really great in fact."

But still, there must be some big plans for the day!

Taylor said she wrote "21st Birthday!" "really big" on her calendar, but "that's about as far as it went for the day."

OK! NEWS: WAS TAYLOR SWIFT & JAKE GYLLENHAAL'S PAPARAZZI COP CALL WARRANTED?

But with a rumored boyfriend of Jake Gyllenhaal she must have some plans to celebrate

"Later on I might have plans, but not really during the day," she admitted with a laugh.