Lily-Rose Depp made a quick outfit change when she and the rest of the cast of HBO’s “The Idol” raged past 4a.m. following their show’s premiere at the Cannes Film Festival.

Depp, 23, was spotted hugging several well-wishers at a party after the HBO project debuted — then disappeared briefly from the late-night bacchanal for an apparent outfit change.

At 3a.m. she was seen back at the Palm Club having changed out of her dress into jeans.

The Weeknd — who attended with his girlfriend Simi Khadra — spent most of the night at the red-lit club in the DJ booth bopping his head and giving occasional shout-outs to the crowd.

“Everybody on the dance floor,” the “Blinding Lights” singer, whose real name is Abel Tesfaye, announced around 2a.m.

He also seemed to take issue with the throngs of people filming him instead of enjoying the tunes, and good-humoredly told one fan as “1999” played, “This is Prince!”

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The Weeknd and Lily-Rose Depp partied till the wee hours following “The Idol” premiere at the Cannes Film Festival.TheImageDirect.com

The Weeknd hung out in the DJ booth at a Cannes club.Getty Images
Depp was dancing on a banquet with her costar, “Bodies Bodies Bodies” actress Rachel Sonnet.

Sonnet — in a candy colored pink dress — had been spotted earlier atop a leather banquette to boogie with director Sam Levinson’s wife, Ashley.

Depp, who plays a pop star in the show, danced on a banquette at the bash.HBO
Earlier at the screening, “Euphoria” creator Levinson got emotional. He was seen tearing up after his latest show was unveiled with a late-night screening that didn’t end until after midnight.

“Being at the Cannes Film Festival has been the biggest dream of my life,” Levinson said. His voice cracked as he told the cast, “I love you guys.”

The show by Sam Levinson will air on HBO.HBO
He then began to cry and hugged Depp and the Weeknd.

To Depp, who has several nude and graphic sex scenes in the first two episodes, Levinson said, “You’re fearless.”