Man crush alert.

Travis Kelce and Jason Kelce praised Prince William after they met the royal at Taylor Swift’s Eras Tour in London last week.

“Dude, he was the coolest motherf – – ker,” Travis, 34, said on Wednesday’s episode of the siblings’ podcast, “New Heights With Jason and Travis Kelce.”

“He was awesome,” added Jason, 36.

The brothers agreed that William, 42, was “so cool” and is “a good dude.”

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Taylor Swift with some members of the royal family.The Prince and Princess of Wales

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Travis (top) and Jason Kelce on their podcast.YouTube / @newheightshow

Travis explained that he didn’t know how to greet the Prince of Wales and his kids Prince George, 10, and Princess Charlotte, 9, backstage at the concert.

“They were an absolute delight to meet. [I] wasn’t sure if I was supposed to bow to them, curtsy, [or] just be an American idiot and shake their hand,” Travis said.

He added: “We wanted to be polite, especially on this side of the pond.”

Jason said that because they weren’t at an official royal event, they didn’t have to bow or curtsy during the interaction.

“But I did still address him as Your Royal Highness,” Jason noted.

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Taylor Swift (left) and Travis Kelce (right) with Prince William and his children Prince George and Princess Charlotte.Taylor Swift/instagram

The former Philadelphia Eagles player also admitted that he “felt emasculated” meeting William, and his brother said that he’s never seen Jason “give that someone that much respect” before.

“They were wonderful people, and that’s what it’s about. You know?” said Jason. “Obviously, literally part of a monarchy, royalty. Hard to be a down-to-earth human being, I would assume. But came off that way completely.”

“Very genuine. Very cool,” Travis added.

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Travis Kelce on his “New Heights” podcast.YouTube / @newheightshow

Jason then shared his praise for William and Kate Middleton’s only daughter.

“I gotta say, Prince William was fantastic, but the highlight was Princess Charlotte. Prince George was great too. She was so f – – king adorable. Like, I cannot,” he said.

“She was a superstar,” Travis added about the 9-year-old.

Jason agreed, saying, “I don’t know. Maybe it’s because I have three girls now. She had fire to her. She was asking questions. That was the most electric part.”

Jason’s comments come after he previously said “f – – k kings” days before he actually met the future king of the UK. “We don’t do royalty,” he said.

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Taylor Swift performing her Eras Tour concert in London on June 21.Getty Images for TAS Rights Management
The Kelce brothers met the royals at the first night of Swift’s Eras Tour stop in London, which happened to be William’s 42nd birthday.

The group, sans Jason, took a selfie together backstage at Wembley Stadium.

“Happy Bday M8! London shows are off to a splendid start,” Swift, 34, captioned her Instagram post.

The Prince and Princess of Wales’ official Instagram account shared a photo of Swift snapping a selfie with the three royals.

“Thank you @taylorswift for a great evening! #LondonTSTheErasTour,” the caption said.

William was also spotted grooving to Swift’s hit “Shake It Off” during the sold-out show Friday.

His youngest child, Prince Louis, 6, seemingly stayed home with Middleton, who has cancer.