What an epic world premiere it was for the new "James Bond" film No Time to Die. The stars, Hollywood actors, and royals alike gathered for the event in London on Tuesday night.

Billie Eilish met Kate and William

For the young Billie Eilish, 19, it was an exciting evening: she is the youngest artist ever to deliver a "Bond" theme song, so she was one of the guests of honour.

Her song "No Time to Die" sets the mood for the last "007" flick with Daniel Craig in the role of the legendary agent.

Duchess Kate and Prince William also insisted on congratulating the talented American singer.

Billie Eilish and Finneas meet Prince William at the No Time to Die premiere.

On the red carpet, Billie and her brother Finneas got to meet Kate and William, looking almost shy as they chatted. 

When the Duchess of Cambridge held out her hand, the "Bad Guy" singer even bowed slightly — seen in the photo above.

Billie Eilish and Finneas meet Duchess Kate at the No Time to Die premiere.

For Billie, the evening certainly marked another milestone in her still very young, but nevertheless highly successful career.

Her "007" theme tune debuts in No Time to Die, which finally opens in the UK on Sept. 30 and in North America on Oct. 8.

You can also click here to see more photos of the royals at the film premiere!