AceShowbiz -

Caitlyn Jenner has shared her first throwback photo. Caitlyn took to Twitter and Instagram on Thursday, June 4 to share a throwback picture of her son Brandon Jenner when he was a baby. She also wished her son a happy birthday. "Happy birthday, Brandon @sprandoni! Love you. #TBT," she wrote alongside the snap.

Happy birthday, Brandon @sprandoni! Love you. #TBT pic.twitter.com/zR34ap1gew

— Caitlyn Jenner (@Caitlyn_Jenner) June 4, 2015

Brandon, who is expecting his first child with his wife Leah Jenner, has yet to respond to his father's post. His birthday comes just three days after Caitlyn made her debut as a woman on the cover of Vanity Fair on Monday, June 1. He previously spoke out in support of his father during the Diane Sawyer interview back in April.

"We're not trying to look back. We're just looking forward," Brandon said about his father's transition at that time. "In seeing him come out to me and explain his true self I was more proud right then to carry the last name Jenner," he added.

In the Vanity Fair interview, Caitlyn said of raising her four children, "I have made a lot of mistakes raising the four Jenner kids. I had times not only dealing with my own issues but exes. [It was] very traumatic and there was a lot of turmoil in my life, and I wasn't as close to my kids as I should have been."