This week's A-list Instagram highlights, from Rihanna at the White House to Lena Dunham channelling Beyonce

No, it's not quite the weekend yet, but it's so close we can practically smell it.

This week in A-list-land, our favourite celebs have been making life just that bit more entertaining for us civilians.

The Delevingne sisters have had a particularly busy week. Cara debuted her NBF (that's new best friend, of course), Halston Sage in a funny napping snap. Halston was rumoured to have been dating her Bad Neighbours co-star Zac Efron this spring, but now she seems much happier snuggling down with her mate Cara. 

Meanwhile, Poppy was up to something much raunchier as she stripped off for a photoshoot while holding a cigarette, captioning the topless black and white picture: "remember that bad decisions = the best stories". If you say so, Poppy...

Kim Kardashian, who made the story of the week by going top-and-bottom-less for Paper magazine, had some much more wholesome updates for her fans. She posted a sweet selection of pictures with herself and husband Kanye, in which they look well and truly loved-up.