Inside Selena Gomez, Post Malone’s wild post-SNL party

Cara Delevingne appeared to support her best friend Selena Gomez after ‘Saturday Night Live’.

After Gomez’s glamorous host party, she and Delevingne celebrated an after-show party on Lavenue at Saks in New York City early Sunday.

A Page Six spy exclusively tells that the couple “sat side by side all evening, taking martinis and cheeseburgers” before leaving at 3 a.m. for some more after-party.

The London-born singer, actress and model, both 29, are longtime friends and even have one. Matching rose tattoo.

Delevingne also plays Gomez’s love interest in the upcoming second season of Hulu’s “Only Murders in the Building”.

Gomez’s stepfather, Brian Tevey, also attended the party and pulled off the father’s final step in the early hours.

“Selina was having so much fun that she almost forgot her phone,” says one witness. “Her stepfather chased her out of the restaurant to get her back.”

The musical guest on SNL Post Malone had a colder night.

The “Sunflower” singer made a grand entrance, arriving with Fleet Foxes’ Robin Beckinold, carrying a lit cigarette and Bud Light and wearing a trucker hat that read, “Do You Believe in Fairies?”

A spy tells us that Malone, 26, greeted every fan who had been waiting outside, taking photos and autographs before entering the party.

We heard that Malone also left John Hancock inside the party, engraving his name on one of the dinner tables at the fine French restaurant.

Apparently Malone didn’t want the night to end, as he stopped by SNL creator Lorne Michaels before being asked to leave at 5:30 a.m.

There were also Formula 1 stars Lewis Hamilton, Paul Rudd, Tommy Dorfman, Colin Jost, Keenan Thompson, Eddie Bryant, Bowen Young, Chris Reed, Bonky Johnson and James Austin Johnson.