Olivia Rodrigo had a frightening encounter with Border Patrol.

While on tour, the singer was almost arrested while trying to return to the United States.

The Disney Channel star-turned-pop star spoke about the horrific experience on Tuesday.

OLIVIA RODRIGO FALLS THROUGH THE HOLE AT THE CONCERT, DIVORTING MADONNA AND LUKE BRYAN IN WILD STAGE MISTAKES

Olivia Rodrigo performs onstage to kick off the “Guts World Tour” at Acrisure Arena on February 23, 2024 in Palm Springs, California. (Christopher Polk/Billboard via Getty Images)

“I got in trouble with the law for the first time in my life,” the 21-year-old admitted on “The Tonight Show with Jimmy Fallon.”

Rodrigo, who has been traveling around the globe since February as part of her Guts World Tour, says the incident occurred as she was leaving Canada.

“We flew from Canada to Portland or something. We were at the border control. I give them my passport and they say, ‘Okay, whatever.'”

But then things changed.

“They knock on the door and say, ‘We need Olivia.'”

Olivia Rodrigo initially assumed that someone was looking for an autograph. (Etienne Laurent/AFP via Getty Images)

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After doing a number of shows recently, Rodrigo thought someone at the border control might have a daughter who would like to sign an autograph.

“I come out, it’s 3 a.m. and I’m delirious, and they take me to a room – and it’s an interrogation room,” she recounted, saying that an armed officer was waiting for her inside. “And he asks, ‘Have you ever been arrested?’ I say, ‘No, I wasn’t arrested.’ And he asks, ‘Are you sure?'”

Rodrigo said the officer’s persistence made her question herself. “I think, ‘Oh my God, maybe I was arrested and didn’t know it.'”

Olivia Rodrigo says she was interrogated for 30 minutes by a border patrol agent who warned her that lying to a federal agent could land her in jail. (Matthew J. Lee/The Boston Globe via Getty Images)

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“He scared me,” she continued. “He says, ‘You know you could go to prison if you lie to a federal agent like that. This is really bad.’”

“I’m freaking out. I’m like, ‘I’m not going to be allowed into America!'” the pop star recalled, saying she was “so scared” at the time and “had a panic attack.”

“I’m freaking out. I’m like, ‘I’m not going to be allowed into America!'” the pop star recalled. (Neilson Barnard/Getty Images for The Recording Academy)

“He scared me. He says, ‘You know you could go to prison if you lie to a federal agency like that. This is really bad.’”

—Olivia Rodrigo

“After 30 minutes of interrogation, he looks at me and asks, ‘What’s your name?'”

“And I say, ‘Olivia Rodrigo. RODRIGO,’” she recalled. “He says, ‘Oh, there’s a girl who looks just like you, your age, who’s been arrested multiple times, and her name is Olivia Rodri.’Guez.’”

The “bad idea, right?” singer wasn’t happy.

“I was angry,” she admitted, wondering why border control hadn’t paid more attention to her name. “Crisis averted,” she concluded.

A representative for Rodrigo did not immediately respond to Fox News Digital’s request for further information.

Olivia Rodrigo, seen here performing in Los Angeles, California, has toured the world. (Christopher Polk/Billboard via Getty Images)

This wasn’t the only hurdle the singer faced during her tour. Earlier this month, the singer tripped and fell into a hole on stage while performing in Melbourne, Australia.

She told Fallon, who played a video of the accident for the audience, that “it was really scary.”

WATCH: OLIVIA RODRIGO FALLS THROUGH THE TRAPDOOR DURING PERFORMANCE

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“Watching the video was pretty frightening. I mean, the show must go on. This is showbiz, baby.”

Luckily, Rodrigo had a positive outlook on the accident, saying she was “really glad it happened in hindsight.” The singer said she was taken to the hospital after her concert as a precaution – to be checked for a concussion – and the nurse assigned to her was a Filipino man with the same name as her recently deceased grandfather. Before her performances in Australia, Rodrigo had performed in the Philippines, where her family had emigrated years ago.

“I thought, ‘Wow, he was looking out for me and making sure I didn’t get hurt.’ And that’s why I’m really glad it happened. I think it’s a beautiful story.