Caitlyn Jenner is stepping up her social media game. 

The 65-year-old star took to Twitter today to post her first Throwback Thursday tweet in honor of son Brandon Jenner's 34th birthday. 

"Happy birthday, Brandon @sprandoni! Love you" the Keeping Up With the Kardashians star captioned an adorable photo of Brandon as a baby boy. 

Brandon, who is currently expecting his first child with wife Leah Jenner, has yet to respond to the post via his own social media page, but surely, the musician is thankful for the shout-out from his proud parent. 

VIDEO: How Caitlyn decided on her new name

 Burt Jenner, Bruce Jenner, Brody Jenner, Brandon Jenner

Alexandra Wyman/Invision for PMKBNC/AP Images

Jenner's birthday comes just three days after Caitlyn made her public debut on the cover of Vanity Fair. The 34-year-old star previously spoke out in support of the elder Jenner during the April Diane Sawyer special, when the Olympian confirmed her transition into a woman. 

(With the release of her Vanity Fair cover on June 1, Caitlyn has chosen to publicly identify as a woman and E! News will refer to her using female pronouns. In stories published prior to this date, Caitlyn was referred to as Bruce and male pronouns were used.)

"In seeing him come out to me and explain his true self I was more proud right then to carry the last name Jenner," Brandon said following the 20/20 special. 

The two have since become much closer as Caitlyn works hard to repair her relationship with her children. 

WATCH: First look at Caitlyn's new docu-series

Caitlyn Jenner, Bruce Jenner, Vanity Fair

Vanity Fair

"I have made a lot of mistakes raising the four Jenner kids," Caitlyn told Vanity Fair. "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."

The E! star also recalled a recent conversation with son Burt Jenner, who said he was looking forward to have a better relationship with Caitlyn. 

"He goes, 'To be honest with you, I think Caitlyn is a lot better person than Bruce.'" Caitlyn revealed. "And I really have to—I think he's right because Bruce always had to tell a lie, he was always living that lie, every day, he always had a secret from morning till night. Caitlyn doesn't have any secrets."

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