Now this is a throwback.
Paris Hilton was the It girl of the naughties. Along with Nicole Richie and their hit TV show The Simple Life, they she oozed naughty rich girl power.
Kim Kardashian appeared in The Simple Life once or twice as Paris' stylist/wardrobe assistant - however, things got a bit weird between the pair for years and they never spoke.
In recent times they've seemed to have made up and put the past behind them - and it shows with Paris' birthday shoutout to Kimmy K.
Kim turned 38 over the weekend and Paris took to social media to wish her a happy birthday.
And the picture she shared? The picture is just GOLD.
Taking it way back to the mid-2000s, of them both in silver dresses - and added in some sparkle for good measure.
She wrote: "Happy Birthday @KimKardashian. Sending you lots of love & happiness on your special day #BeautifulBirthdayGirl."
Iconic.
We just wonder if Kim will be invited to her upcoming wedding... that will really show if they're back being BFFs or not.
