Blake Lively’s son Olin’s first birthday was one to remember!

The “Gossip Girl” alum hilariously revealed she baked her son a boob-themed cake to celebrate the milestone during a recent appearance on BBC Radio 2’s “Zoe Ball and Friends.”

“My birthday cakes always have a little bit of a sense of humor, for my 𝚋𝚊𝚋𝚢 I just did a giant set of t-ts,” Lively told Ball, who burst into laughter.

Blake Lively revealed she baked her son a boob-themed cake on BBC Radio 2’s “Zoe Ball and Friends.”

“I just did a giant set of t-ts,” she told host Zoe Hall. BBC Radio 2

“Which I feel like will haunt him for life,” she jokingly added.

The “It Ends With Us” actress, 36, explained that her son is too young to voice what he wanted so she took a little creative leeway.

“But, what do they want at one? He can’t declare what he wants. So, boobs!”

Lively explained she always adds “a sense of humor” to her kids’ cakes.

However, she admitted the bold choice for her son might “haunt him for life.” ?Instagram

“I’ll show you a picture after, they’re pretty amazing,” she said, before clarifying, “Of the cake, not of mine … Also amazing though.”

Lively is an avid baker and occasionally shares her confections on her social media pages. Over the past couple of years, she’s whipped up a lifelike watermelon cake, a sleeping unicorn and a few “birthday pies” — her husband, Ryan Reynold’s treat of choice.

She even appeared on the “Great British Baking Show” last year and once had her own cooking and lifestyle blog called Preserve.

The couple share four children: James, 9, Inez, 7, and Betty, 4, and Olin, 1. Getty Images

They welcomed son Olin in February 2023. Getty Images

Page Six confirmed in February 2023 that Lively and Reynolds, who wed in 2012, had welcomed their fourth child.

However, the couple kept their little one’s 𝓈ℯ𝓍 and name a secret for over a year. Reynolds announced his son’s unusual Nordic moniker while giving a sentimental speech at the “Deadpool & Wolverine” premiere last month.

“I want to start by saying thank you to my wife, Blake, who is here,” he said onstage. “I want to thank my kids, James, Inez, Betty, Olin, who are here. I hope that, if I’m lucky, this moment will be the most traumatic thing — that is, the contents of this movie — that happens in your wondrous life.”

The couple didn’t reveal the name or 𝓈ℯ𝓍 of their youngest until he was 1. GC Images

They have kept their kids out of the spotlight. WireImage

Reynolds, 47, and Lively also share daughters James, 9, Inez, 7, and Betty, 4.

A week later, Reynolds revealed Olin was a boy while talking to John Bell, a Wrexham AFC fan, who was mourning the loss of his own son.

“I want to share with you that I too have a son and that if … boy, John, if I love him one-tenth as much as you love Jake, I feel like I’ve done a pretty damn good job,” Reynolds said in a video shared to Instagram.

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However, the little ones did have a short cameo in Reynolds’ “Deadpool & Wolverine” movie. GC Images

The pair have been married since 2012. GC Images

Although the A-list couple keep their kids out of the public eye, Olin and Inez had small roles in the new Marvel movie.

While the 7-year-old was credited as Kid Pool, Olin was named Baby Pool.

Shawn Levy, the film’s director and Olin’s “proud godfather,” later called the 𝚋𝚊𝚋𝚢’s voice cameo his “favorite.”