• Billie Eilish revealed she was given a "list" of royal rules to follow ahead of the "No Time to Die" premiere
  • The singer said she found the British royal family very normal and easy to talk to
  • Prince William, Kate Middleton, Prince Charles and Camilla, Duchess of Cornwall, attended the September premiere

Billie Eilish is opening up about meeting the British royal family for the first time at the "No Time to Die" premiere.

The 19-year-old performer, who wrote and sang the theme song of the latest James Bond film, attended the London premiere of "No Time To Die" with her brother and writing partner Finneas O’Connell in September. At the event, the siblings were introduced to Prince William, Kate Middleton, Prince Charles and Camilla, Duchess of Cornwall.

During a recent appearance on "Jimmy Kimmel Live!," Eilish admitted that she may have broken some royal rules.

When asked by host Jimmy Kimmel whether she'd been informed of protocol for meeting royals ahead of the premiere, the singer confirmed, "Oh yeah. There was a whole list of things I had to follow."

But when asked whether she'd paid attention to those rules, Eilish mouthed "no" in response to the question, before explaining, "I tried to [follow royal protocol]. I was planning on it, and they were just so normal, like they didn't make me feel like: 'Oh, I’m scared, I can’t talk to them.'"

"They were very complimentary and they had all these questions for me and they were just very friendly and, like, funny and sweet. I don't know, I can't complain, it was amazing," the singer added.

The royal family's website states that there are "no obligatory codes of behavior when meeting the Queen or a member of the royal family," but individuals can observe the traditional forms of introduction such as a neck bow or curtsy.

"No Time to Die" star Rami Malek also recently shared his experience with the royal family during the premiere. The actor told Entertainment Tonight that he treated Prince William, Duchess Kate, Prince Charles and Duchess Camilla "like I would anybody else."

"I'm sure a dose of normality is probably something that is quite refreshing to them," he explained.

Malek also revealed that Prince William and his wife "seemed pretty taken aback" by the latest James Bond movie during the film's screening, where the actor had been sitting right behind the four royals.

Meanwhile, Eilish's "No Time to Die" single, which was initially released in February 2020, recently went platinum in the U.K.  The track is also certified platinum in other countries, including Canada and Australia.

The official James Bond Twitter congratulated her on her achievement, posting a photo of Eilish and her brother posing alongside Daniel Craig and Malek.

"Congratulations to @BillieEilish for her single #NoTimeToDie going platinum. Here are Daniel Craig, Rami Malek, Billie Eilish, and @Finneas at the #NoTimeToDie screening event and platinum record presentation," the tweet read.

Billie Eilish with Fender Ukulele Billie Eilish plays Fenders Billie Eilish Signature Ukulele in a promotional photo. Photo: Fender