Ryan Seacrest celebrated his 40th birthday with the Kardashians and his former American Idol co-stars.

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The American Idol host enjoyed his milestone birthday party in Napa, CA, on Saturday with guests ranging from Keeping Up with the Kardashians stars Kim Kardashian and Khloe Kardashian to former Idol judges Paula Abdul and Randy Jackson.

Kim and Khloe shared photos from the party on Instagram Sunday. Their family's reality series has been executive produced by Ryan Seacrest Productions since 2007.

Both sisters sported cleavage-baring ensembles at the event and got some advice from Kevin Systrom, the CEO and founder of Instagram.

Seacrest's party took place more than two months after his actual December 24 birthdate. It was apparently "too much fun," according to Kim, who started posting blurry photos on social media later into the night.

Seacrest has served as the host of American Idol since its first-season debut back in 2002 on Fox.


About The Author: Elizabeth Kwiatkowski
Elizabeth Kwiatkowski is Associate Editor of Reality TV World and has been covering the reality TV genre for more than a decade.