When you put superstar and Taylor Swift concert in the same sentence, one automatically thinks of the megastar.

That is unless there’s royalty present.

“I got to say Prince William was fantastic, but the highlight was Princess Charlotte,” Jason Kelce said during the June 26 episode of “New Heights” podcast. “Prince George was great, too. She was so f—— adorable.”

His brother Travis Kelce agreed.

“She was a superstar,” Travis Kelce said.

The brothers talked about meeting the “superstar” along with her father Prince William and brother Prince George at a Swift concert in London last week, per Today.

While Princess Charlotte was deemed a “superstar,” Prince William was “cool,” Jason Kelce said.

“Dude, he was the coolest mother——. He was so cool,” the older brother said. “He’s a good dude.” 

The moment was memorialized with a self of Swift, Travis Kelce and the royals.

“They were an absolute delight to me,” Travis Kelce said. “(I) wasn’t sure if I was supposed to bow to them, curtsy, just be an American idiot and shake their hand.”

“They said that because we weren’t at an official royal event, we didn’t need to bow or curtsy,” Jason Kelce said, adding he called William “Your Royal Highness.”

“They were wonderful people,” he said.

Jason Kelce said he could not believe how approachable the prince was.

“Hard to be a down-to-earth human being, I would assume, but came off that way, completely,” he said.

“Very genuine, very cool,” Travis Kelce added.

But the star of the night was Princess Charlotte.

“Maybe it’s because I have three girls now. She had fire to her, she was asking questions. That was the most electric part of the (night),” Jason Kelce said.

Travis Kelce was in London to support Swift during her three shows at Wembley Stadium from June 21 to 23. 

He got more involved by getting onstage at the June 23 concert.

The Kansas City Chiefs tight end joined Swift for the pantomime skit leading to “I Can Do It With a Broken Heart.” 

During the concert, Travis Kelce went onstage wearing the same black-and-white suit and top hat as two of Swift’s other dancers.

He acted out the musical interlude with the singer and picked up Swift and placed her on a red couch before she made a wardrobe change.

He then watched as she  walked away with a wide smile on his face. He and the other dancers were then lowered beneath the stage.