"Calvin announced that Ellie was there and she DJ'ed with him for a bit," an eyewitness told E! News. "They were all dancing."
Care for a drink, ladies?
Taylor Swift has been known to throw a few fabulous shindigs over the years. From secret album listening parties to amazing birthday celebrations, the "Shake It Off" singer knows how to go big for her admirers.
But on Saturday, the 25-year-old opted for more of a relaxing afternoon with just a few of her famous friends.
"Well this is bloody CHILL," Ellie Goulding wrote on Instagram after posing with Swift, Selena Gomez and members of HAIM. The ladies were all smiles as they enjoyed a modern-day tea party with a little booze for Goulding.
Away from the table, Gomez posed for photos with her BFF who she described as "so fluffy." After all, that is one fabulous jacket T. Swift is working.
Recently, the "Blank Space" crooner opened up about how important her female friendships are to her. While finding a boyfriend may not be a priority, staying close to her gal pals is another story.
"The thing about my girlfriends right now is that none of them needs me for anything other than friendship," she told The Telegraph. "I love the fact that they are all passionate about their jobs, whatever their jobs are."
She added, "A lot of celebrity-type people have this group of people around them where their friends' main priority is them, and they feel comfortable with that dynamic. I don't feel comfortable with that dynamic."
We've said it before and we will say it again: If you've got another invite to spare Swift, we'd love to have one for your next event.
—Additional reporting by Sara Kitnick