03/11/2013 at 07:30 PM EDT
is singing the blues about her birthday.
"It's actually not my birthday," the country star, who turned 30 on Sunday, tells CMT Radio
. "It is the first anniversary of my 29th birthday. So it's more of an anniversary celebration than a birthday. I mean, I'll still, like, blow out candles and stuff because I want my wish, but it's not a birthday."
Her hubby, Mike Fisher, on the other hand, loves all three decades of her in a sweet Tweet
"30 years ago today my best friend was born," he wrote. "Happy birthday @carrieunderwood."
Underwood responded with an equally kind message
that said, "Aww…Love you more than anything."
For her 29th, Fisher, 32, threw Underwood a surprise '80s-themed party. There's no word yet on what she did this year.