Taylor Swift and Calvin Harris went on a double date with BFF Gigi Hadid and rumored boyfriend Joe Jonas as they went boating on the River Thames in London on Sunday.

The "Bad Blood" singer was in London to perform at the Hyde Park to a sold-out crowd.

"The quintet enjoyed a trip on the Thames Limo, a private luxury charter which cruises at the maximum speed of 30 knots," Daily Mail. "The boats, recognisable by their distinctive Union Jack branding, can be hired out for private tours and transfers and come with a caption and hostess."

Karlie Kloss also joined the double date and the American model went on a trip alone.

Kloss didn't mind being the fifth wheel as Joe Jonas and Gigi Hadid cozied up to each other, and so did Taylor Swift and Calvin Harris.

Taylor Swift also teased the model when he posted a photo on her Instagram showing the group smiling for the camera. She wrote, "Little known fact: Karlie is secretly an unofficial historian/London tour guide. Kind of."

Although Taylor Swift and Calvin Harris have already confirmed their relationship, Joe Jonas and Gigi Hadid are still coy about the rumors they are dating.

A previous report from E! News claimed that Joe Jonas and Gigi Hadid are not dating, at least not yet anyway.

The source claimed, "Gigi and Joe are hanging out again romantically. They are taking things light and just enjoying each others' friendship. Gigi feels very comfortable with Joe and it's very easy to talk about everything that's going on in her life with him. He understands where she is at and they are not in any rush."

Joe Jonas was Taylor Swift's ex, and Gigi Hadid and the former member of the Jonas brothers also dated for a while before she moved on to Cody Simpson. They broke up earlier this year.