Erase the last five years of Pharrell Williams' output from your mind. Forget the 'Happy' era, the stupid hats, the Blurred Lines fiasco and the time that N.E.R.D did that song for The Spongebob Squarepants Movie.

There was a time when Williams - and his N.E.R.D. bandmates Chad Hugo and Shay Haley - couldn't put a step wrong, but it's been seven years since their last album was released.

Now, it looks like the hip-hop/rock/funk/pop crossover band are on the comeback trail, as they've just revealed a new song with none other than Rihanna.

It's called 'Lemon' and it certainly sounds more like the old N.E.R.D. to us.

Watch the video below: