Taylor Swift just got dissed by her famous ex on live TV

With so much talk of the rivalry between her and Katy Perry, we would have expected the mother of all disses against Taylor Swift to come from the California Girls star.

Suffice to say we were wrong, because that diss was delivered by none other than Taylor’s ex – and Katy’s on/off boyfriend – John Mayer.

The singer was making his final guest host appearance on The Late Late Show last night, and it seems he just couldn’t resist getting a dig in at Taylor before his presenting run came to a close.

Bringing up the subject of this weekend’s Grammy Awards, the Who You Love singer joked: “You can see me at the Grammys doing what I do best, being avoided by Taylor Swift.”

He went on to demonstrate exactly what such a snub looks like, before adding: “That won’t make the internet at all”.

He dated Taylor back in 2009, before breaking up with her (and reportedly leaving her hreartbroken in the process), inspiring her song Dear John.

With rumours rife that Mayer is back with Katy Perry once again, perhaps this was a burn they concocted together.

Check out the video below.