Derek Hough celebrated his 32nd birthday with his girlfriend Hayley Erbert by his side.

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The former "Dancing with the Stars" pro dancer rang in his birthday Wednesday with Erbert, 22, and received a sweet message from sister Julianne Hough.

"Happy Birthday to this handsome man of mine. I love you," Erbert, also a dancer, captioned a photo of herself kissing Hough.

Julianne Hough shared a series of throwback photos and a lengthy post on her own account.

"Happy Birthday to my big brother!" the 28-year-old dancer wrote.

"I'm so lucky to be your little sister and to have had you to look up to my entire life. You never cease to amaze me with your talents, gifts and your heart!"

"We have had so many adventures together in this journey we call life. Great ones, scary ones, tough ones, fun ones and hilarious ones. But just know I can't wait to do all the adventures with you!" she added. "I love you so much Derek!"

Hough and Erbert, who has appeared on "So You Think You Can Dance" and "Dancing with the Stars," have been linked since 2015.

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Hough said in an interview with "The Ellen DeGeneres Show" in November that he's thinking of settling down.

"I'm kind of in a place now in my life where I'm transitioning. I see myself married and with kids in the next five years," he shared.

Hough came to fame as a professional dancer on "Dancing with the Stars," and will serve as a judge on the new NBC reality competition "World of Dance."

The series features Jenna Dewan as host, and premieres May 30.