Justin Bieber is ready for a showdown.

In June of 2019, the "Yummy" singer took to Twitter to challenge Tom Cruise to a "fight in the octagon," saying the movie star "will never live it down" should he not engage.

Just days later, Bieber, now 25, admitted that his challenge was in jest.

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“It was just a random tweet. I do that stuff sometimes,” Bieber told TMZ at the time. “I think he would probably whoop my a-- in a fight. He’s got that dad strength.”

However, during a recent appearance on James Corden's "Carpool Karaoke" segment of "The Late Late Show," the singer walked back his previous statements, claiming he could beat the 57-year-old actor in a fight.

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When Corden told Bieber he'd bet that Cruise would win in a fight, Bieber said that "there's absolutely no way" that would be the case.

"He's not the guy you see in movies," the singer explained. "That's a character. [Being in] phenomenal shape doesn't mean you're a good fighter."

When Corden insisted that Cruise would be victorious, Bieber clapped back.

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"You're mesmerized by the characters that he's playing," Bieber said. "I'm telling you ... I'm dangerous. My agility is crazy. My agility is insane."

He added: "I'm the Conor McGregor of entertainment."

After Bieber's initial challenge, McGregor, a professional mixed martial artist, offered to host the fight.

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"If Tom Cruise is man enough to accept this challenge, McGregor Sports and Entertainment will host the bout," tweeted the 31-year-old athlete. "Does Cruise have the sprouts to fight, like he does in the movies? Stay tuned to find out!"