Caitlyn Jenner celebrated Father's Day (21.06.15) with all her children.

Bruce Jenner,Kendall Jenner (c) Instagram

Bruce Jenner,Kendall Jenner (c) Instagram

The former Olympian - who was known as Bruce Jenner before her transition - threw a party at her Malibu home which was attended by her six kids and four stepchildren.

And according to TMZ, it is unusual for all her offspring -

sons Brody, Brandon and Burt Jenner and daughters Cassandra, Kylie and Kendall Jenner, and stepkids Khloe, Kourtney and Rob Kardashian and Kim Kardashian West - to celebrate together as the boys and Cassandra rarely went to the events previously organised by Caitlyn's ex-wife Kris Jenner.

Caitlyn's fashion model daughter Kendall Jenner, 19, paid a moving tribute to her father on social media on the day.

She penned: "My whole life this soul was my daddy and just because your appearance is different now doesn't mean you were any less of a father to me my entire life.

"Happy Father's Day to the person who raised me, and taught me everything I know, my hero."

And 17-year-old sister Kylie Jenner uploaded an old picture of herself with Bruce and Kendall.

Using words from Caitlyn, she captioned the picture: "Happy Father's Day my little light of sunshine 'You can still call me dad, Kylie. No matter what I'm always going to be your father. That's never going to change.' "

Meanwhile, Khloe Kardashian - the daughter of the late Robert Kardashian - captioned an old photo of the two on Instagram: "Thank you Lord for blessing me with not one phenomenal father but I was lucky enough to have two."