He’s already a proud papa!

Olympic star Ryan Lochte took to Instagram on Saturday, Jan. 28 to share an exciting update on his fiancée Kayla Rae Reid’s pregnancy! The doting dad couldn’t help but gush as he shared a sonogram photo of his unborn child.

“My baby boy is growing!!!! Doc says he has long legs! #bigboy #daddy #tooexcited,” the 32-year-old competitive swimmer wrote in the caption of the sonogram shot that showed baby Lochte’s profile.

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The happy couple announced their pregnancy last month with an adorable underwater photo shoot. In the photo, Kayla stood in a pool while Ryan dove underneath, kissing her belly.

“My Christmas gift came early this year, can't wait for next year! Best news I've ever received,” he wrote in his pregnancy announcement.

Kayla is also excited to be a mom — and ever since they announced their pregnancy, she’s been posting baby bump updates on her Instagram page. Her tiny bump made its debut last month while Kayla wore a bikini and layed out by the pool. And just last week, she showed off some more progress as she posed sideways, cradling her bump in her hands.

“Baby or burrito,” the 25-year-old captioned the photo.

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Baby or burrito? 😜👶🏼🌯

A post shared by KAYLA RAE LOCHTE (@kaylaraereid) on

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She also loves to show off her engagement ring on social media. She shared a photo of her bling as she clutched the handle of a mug with her left hand that read “The. Mrs” on the front.

Ryan proposed to the Playboy model last October after nine months of dating. The Olympian gushed about how he knew Kayla was the one just days before he popped the question.

"From the very first time I met her, everything has like clicked,’’ he told USA Today. “That’s why I know I can propose to her because everything that’s happened and she’s been keeping me so positive. She doesn’t care about my fame. She doesn’t care about anything. All she cares about is me being happy."