John Mayer Tweets And Deletes Post Calling Taylor Swift's Birthday 'The Lamest Day Of The Year'

John Mayer thought he'd celebrate his ex girlfriend Taylor Swift's birthday with a classic celeb move last night, by tweeting and deleting a super shady message.

The singer declared December 13 (aka Tay's birthday) was the 'lamest day of the year' in his eyes.

And then swiftly deleted it.

Does John Mayer not realise that there's this thing called screen grabbing now? 

Tay and John dated for a few months back in November 2009 to February 2010, inspiring the Shake If Off singer to pen 'Dear John' all about him.

Just keep doing what you're doing, celebrities.

Check out all of the latest celeb news below (go on, you know you want to):