Official couple is official!
What more proof do you need?
This is how love declarations are done in the modern day, after all.
The photo shows the model leaning against a railing on a boat on the Thames with Big Ben in the background.
Joe’s only caption was a Union Jack flag emoji, but we know he probably really wanted to put a thousand thumbs up and heart emojis instead!
The 25-year-old also posted a photo of himself opening champagne on a boat, which was most likely taken by Gigi:
#IMONABOATA photo posted by J O E J O N A S (@joejonas) on Jun 28, 2015 at 7:50pm PDT
See a pic of GI Joe on another boat in the gallery (above)!
[Image via Joe Jonas Instagram]