Former BFFs Kim Kardashian and Paris Hilton reunite

Kim Kardashian has been living it up in Ibiza to celebrate Givenchy designer Riccardo Tisci's birthday.

It was quite a bash that led to quite the reunion:

"Reminiscing about the 1st time we went to Ibiza in 2006!

it was so good to see you & catch up!! Loves it lol"

And, as a special treat, here's a throwback snap of the former BFFs (taken in 2007 when Paris was more famous than Kim - hard to remember, isn't it?):

Back in Ibiza, Momager Kris and sister Kendall were also there to fete the birthday boy:

As were supermodels Kate Moss and Naomi Campbell:

Kim also shared a pic of her hubby in bed:

He looks so peaceful, doesn't he?

Kim shared the photo of herself sitting on a bed with her husband sprawled out in the background with the caption, "Side chicks be like...."

(if anyone can explain the strange caption please do)