Who is this million-selling artist, and why on earth are they dressed as George Michael?

We'll give you a clue: she's female, English, has sold an estimated 40 million copies of her two albums and the world has been patiently waiting for her third for oh, four years now.

Alright, alright.

It's not often that Adele tweets these days, but when she does, she makes it worthwhile.

While the world is still waiting for her next album '25', the star celebrated her 27th birthday on Tuesday - and yesterday she posted pictures of herself dressed as her "hero" George Michael, circa his 'Faith' period, designer stubble and all.

It's gotta be said, she makes a pretty convincing George Michael… see for yourself below: