Kendall and Kylie Jenner, along with their half sister Khloé Kardashian, paid tribute to Caitlyn Jenner on Sunday for Father's Day [1]. The three stars took to Instagram to share heartfelt messages about Caitlyn, who recently transitioned into a woman [2]. Kendall called Caitlyn her "hero," and Kylie called her "my little light of sunshine." Khloé expressed her gratitude at having two father figures while growing up by sharing a snap of Caitlyn, before her transition, sitting with her late father, Robert Kardashian.

The sweet messages come less than a month after Caitlyn made her gorgeous debut on the July cover of Vanity Fair [3]. Since then, she's been busy adjusting to her new life. In June alone, she celebrated her transition with her plastic surgeon [4], went on her first public outing at LA's LGBT Youth Center [5], and has been busy filming her upcoming E! docuseries [6], I Am Cait.

Kendall posted this sweet photo, with the caption, "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 [7] to the person who raised me, and taught me everything I know, my hero."

Khloé Kardashian also gave Caitlyn a sweet shout-out with this photo, writing, "Thank you Lord for blessing me with not one phenomenal father but I was lucky enough to have two. Happy Father's Day [8]!!!"

"Happy Father's Day [9] 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,'" Kylie captioned this adorable photo.