Posting a plate of cookies to social media with the words 'peace at last' scrawled across the top in red icing, the California Girls singer tagged the Reputation songstress and wrote: "Feels good".
Taylor Swift then left a series of love heart emoji's in the comment section.
The two pop sensations mended their friendship last year when Katy extended a literal olive branch wishing her former enemy well before her first Reputation Stadium tour show.
So why post yet another friendship post on Instagram?
Fans are convinced that Katy and Taylor are now gearing up to collab on some new music together, as the notoriously cryptic singers are known for dropping sly hints on their social media before releasing a new song.
Could a Taylor and Katy collab be on the cards?