See How the Stars Celebrated Father's Day

— -- The stars celebrated Father's Day Sunday by posting photos of themselves and the special dads in their lives.

For Justin Timberlake, this Father's Day was particularly special, since becoming a father himself in April.

FLEXIN' on Fathers Day," the singer wrote on Instagram, alongside a photo of him holding son Silas. "#HappyFathersDay to ALL of the Dads out there from the newest member of the Daddy Fraternity!!"

Fellow new dad Ryan Reynolds posed with his daughter James for a photo posted by wife Blake Lively.

"Happy Fathers Day!!! ... @vancityreynolds Since the day our baby was born, I've felt so strongly in my heart that you were most likely the father," the actress joked.

Kim Kardashian used the occasion to announce the news that she and husband Kanye West are expecting a boy.

"Precious moments like this when we were traveling on tour with you are what I live for. You're such a good daddy to North & you will be the best daddy to our new son too!" she wrote on Instagram.

She also posted a throwback photo of West and North, writing: "I'm so lucky to be married to a man who is so in love with his daughter, your bond is so irreplaceable! Thank you for being such a good dad! We love and appreciate you so much! We're so blessed to have you!"

Other members of the Kardashian family were celebrating Caitlyn Jenner, formerly Bruce Jenner. Kylie Jenner wrote, "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.'"

Kendall Jenner was equally touching: "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," she wrote.

Supermodel Gisele Bundchen posted a photo of her star quarterback husband Tom Brady embracing his three children. "Happy Father's Day!!!! We love you!!!" she wrote in English and Portuguese.