(Kourtney Kardashian's baby announcement in OK! Magazine / via officialkourtneyk.celebuzz.com)

Now they know what colour to paint the nursery, and the producers of Keeping Up With The Kardashians now have storylines to plan with Kourtney Kardashian announcing that she's expecting a baby girl.

Kourtney broke the news on her Twitter account, with a link to an OK! Magazine cover that said the same thing (let's also presume they've struck a deal too).

It's a girl! bit.ly/A7fh58 Kourtney Tweeted.

She's due to give birth in May and it's possibly fair to say that Jessica Simpson is another celebrity having a girl after she was spotted buying pink baby clothes in LA boutiques. But you never know.

Congratulations in advance Kourtney (and Scott) and all the best with the birth!