Derek Hough is celebrating his birthday in the cutest way!

The pro dancer took to Instagram on Tuesday, May 17 to share a sweet baby photo of himself in honor of his 31st birthday — and he looks so adorable in the throwback snapshot!

"Not sure what I'm looking at here, but who would have known all that I had to look forward to. #31 #AndWeAreJustGettingStarted #BirthdayVibes," the DWTS alumnus captioned the sweet pic.

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Derek — who was born on this day in 1985 — is the older brother to 27-year-old actress Julianne Hough. Happy Birthday, Derek!

Click through the gallery below to see more celebrity childhood throwback photos!