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Carrie Underwood is geeking out over the New Kids on the Block!
The country star had a total fangirl moment after singing "Happy Birthday" to NKOTB members Jordan Knight and Danny Wood during the group's Total Package Tour stop in Nashville, Tennessee, on Wednesday.
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The clearly surreal stage experience left Underwood in shock.
Um - Birthday - Dannywood - @ - Jordanknight
"Um...did I just sing happy birthday to @dannywood and @jordanknight on stage with the NEW KIDS ON THE BLOCK?!?! Yup!" she excitedly tweeted.
The 34-year-old GRAMMY winner also shared a photo with NKOTB on Instagram and videos from the concert.