The pair were spotted getting into a car together after the party on Monday, April 26, in pictures obtained by Page Six.
Jackson also posted a photo with the 28-year-old on Instagram, in which she wore a white Monique Lhuillier dress and Delevingne donned a Ronald van der Kemp tuxedo top and black pants. The Suicide Squad actress also posted a photo with Jackson on her own account.
In a since-removed Instagram Story, captured by The Daily Mail, Jackson appeared to show off a matching rose tattoo with Delevingne.
Over the years, it's been speculated several times that Jackson and Delevingne have been an item.
The pair were first sighted together in 2017. In December of that year, Delevingne reportedly invited Jackson as her guest of honor to the Christmas Burberry X Bash in London, and they were seen trying to sneak out together.
In 2018, they were reportedly spotted kissing and dancing on an outing with Macaulay Culkin and Brenda Song. However, in August of that year, the model went public with now ex-girlfriend Ashely Benson before they split in May 2020.
"There's no denying there's a spark," a source told The Sun when Jackson and Delevingne were first linked. "They really hit it off at the MTV Movie and TV Awards in Los Angeles in May  and have been hanging out since ... Cara is quite enamored by the fact Paris is the daughter of one of her musical heroes."
The recent rumors that Jackson was dating Emile Hirsch have also since been debunked, and the pair are just said to be friends.
Although Delevingne has been out for some time now, she confirmed that she is pansexual last year. Jackson previously said she came out as part of the LGBTQ+ community when she was 14, but told PEOPLE she does not feel the need to label her sexuality.
"Labels in general, not just for sexuality but for everything, I think, are just ways for humans to make sense of the world, to be able to compartmentalize ... We're getting past the need for labels. It's beautiful," the 23-year-old told the outlet in August.