Taylor Swift & Calvin Harris Hang Out With Taylor's Ex and New Girlfriend (PHOTO)

calvin harris taylor swift Love celebrity-style involves staying friendly with the exes ... at least certain ex-lovers. Calvin Harris and Taylor Swift are a hot item right now (aww) and some new developments have come to light that show just how tight they are as a couple. Things are clearly getting very serious -- Calvin expressed his love for Tay on his Instagram (a first!), and Taylor and Calvin are partying with Swift's ex-boyfriend Joe Jonas, which shows how much trust they have in each other.

Taylor's ex Joe is now dating Gigi Hadid, one of Taylor's friends. And so they all hung out together with Tay's other bestie Karlie Kloss as they toured London on a boat. Love this!

Little known fact: Karlie is secretly an unofficial historian/London tour guide. Kind of.

A photo posted by Taylor Swift (@taylorswift) on Jun 28, 2015 at 11:05pm PDT

See? Everyone gets along just swimmingly.

And speaking of getting along ...

She cooks too ðï¿½ï¿½¥ðï¿½ï¿½¥ðï¿½ï¿½¥

A photo posted by Calvin Harris (@calvinharris) on Jul 2, 2015 at 9:12pm PDT

Calvin seems very much in love with Taylor as he Instagrammed this pic with the caption: "She cooks too." She's the whole package, but we already knew that.

This group is reportedly now in Rhode Island for a big Independence Day party Taylor Swift–style. It's a tradition. This year she has Calvin to share the weekend with, and the invite list reportedly includes her ex Jonas and Gigi, along with Ed Sheeran, Lena Dunham, Cara Delevingne, and Selena Gomez. Can't wait to see more Instagrams from the bash!

Can you believe Taylor hangs out with her ex?

Image via Christopher Peterson/Splash News