Taylor Swift Dedicates 'Never Grow Up' to Her Godson in Concert

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Taylor Swift performs on the main stage on day two of BBC Radio 1's Big Weekend at Earlham Park on May 24, 2015 in Norwich, England. 

Taylor Swift is always surprising fans, especially while she's on her 1989 World Tour. During her stop in Santa Clara, Calif., on Saturday (Aug. 15), Swift played her song "Never Grow Up" for the first time on the tour and dedicated it to her new godson.

One of Swift's many famous friends, Jaime King, named the singer godmother to her second child, Leo Thames. After meeting Leo three weeks ago, Swift insinuated that "Never Grow Up" has taken on a whole new meaning.

"I wrote it when I was like 18 or 19, but my friend just had a baby and she made me godmother of it and I was holding this little baby the other night, and I was just thinking differently," she said. "When you're holding onto something that's so innocent and so perfect and has no idea what's coming for it with the world. The world is going to throw so many things at you as we grow up."

Watch Taylor Swift and Fifth Harmony Perform 'Worth It' at Levi's Stadium

King wasn't in attendance, but saw a clip of Swift's dedication and tweeted, "This is so beautiful Tay - Leo Thames is so blessed."

Prior to "Never Grow Up," Swift brought out Little Mix to duet on their hit "Black Magic." But the special surprises didn't stop there -- later in the show, Julia Roberts and Joan Baez joined Swift during "Style."

Watch a fan-filmed video of "Never Grow Up" below.