By Dailymail.com Reporter
Published: 16:59 GMT, 18 February 2019 | Updated: 16:59 GMT, 18 February 2019
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They first met as little girls.
And while Kim Kardashian's once close friendship with Paris Hilton has cooled over the years, the reality star was quick to offer her congratulations as the heiress turned 38 this weekend.
Taking to Instagram, Kim shared a series of throwback shots of her and Paris in their early twenties, writing: 'Happy Birthday!'
Say cheese! Kim Kardashian celebrates onetime BFF Paris Hilton's birthday as she shares throwbacks of the pair; the two are seen here in Ibiza in 2006
All wrapped up: Kim, seen Sunday night, shared the pictures to mark Paris' 38th birthday
While today Kim, 38, is the world's most famous reality star, there was a time when Paris was the one best known for the genre.
Back when Paris was filming The Simple Life with Nicole Richie, from 2003 to 2006, Kim frequently appeared on the show under the guise of a 'stylist'.
The mother-of-three was seen helping her friend sort