Kim Kardashian celebrates onetime BFF Paris Hilton's birthday as she shares bikini throwbacks of the pair By Dailymail.com Reporter Published: 16:59 GMT, 18 February 2019 | Updated: 16:59 GMT, 18 February 2019 Viewcomments 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 out her closet, organizing Paris' clothes. Throwback time! While today Kim is the world's most famous reality star, there was a time when Paris was the one best known for the genre As they were: While today Kim is the world's most famous reality star, there was a time when Paris was the one best known for the genre; they are seen in 2006 in a pic posted by Kim Then in 2006 when Paris' friendship with Nicole came to an abrupt end, Kim was on hand to fill the gap. She reflected in a 2015 interview with Rolling Stone that their bond was built over a mutual desire to become famous. 'We'd go anywhere and everywhere just to be seen. We knew exactly where to go, where to be seen, how to have something written about you. 'All you had to do is go to this restaurant, or this party, talk about whatever you want to talk about, and it would be in the paper the next day.' Party girls: Kim has admitted that the two, seen in 2006, would 'go anywhere' Reality bites: The two spent a year in one another's company, before falling out However after their initial closeness, the two fell out, with Hilton memorably describing Kim's shapely rear as 'cottage cheese stuffed in a trash bag' during an April 2008 interview. Then Kim responded 'Paris who?' when asked about her former friend during an interview with party pal Lindsay Lohan. A few years later Kim said in an interview that the two simple 'drifted apart'. While they no longer spend time together, the onetime BFFs now seem to have a cordial relationship, tagging one another on social media from time to time. Share or comment on this article: All rights reserved for this news site dailymail and under his responsibility