Katy Perry and Justin Trudeau are the latest A-listers to announce their relationship status online. But there are many ways to do it - from fancy dress to panicked deletions

As a mark of pure intent, going Instagram official has become a firmly entrenched dating marker. To post a picture of you and your new partner on Instagram – on the grid, mind you, not hiding behind the cowardice of a story – is to not only declare that you are in love, but also that you are confident enough in your future to share it with the world.

As such, Katy Perry’s decision to go Instagram official with Justin Trudeau is a classic of the genre. Long dogged by rumours that they might be together, Perry this week debuted a sanctioned image of them both. They are cheek to cheek. They are smiling, albeit in that slightly strained hurry-up-and-take-it way you do when someone decides to shoot a whole reel of photos. Katy Perry is pulling the exact same face she did when she stared into the camera that time she sort of went into space, which is how you know that it is really serious. Good luck to the pair of them.

The Guardian’s picture editors select photographs from around the world