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Christina Aguilera, Max Bratman

Courtesy of LEGOLAND

"Ain't No Other Man" singer Christina Aguilera and her little man enjoyed some quality time together on Thursday. The occasion? Max's fourth birthday!

Yup. It seems like only yesterday the Voice judge welcomed her sweet son into the world. But there he was, taking control of a speedboat (with a little help from mom, of course) at Legoland in Carlsbad, Calif. The dynamic duo hit up several other attractions at the theme park with friends and Aguilera's boyfriend, Matt Rutler.

"Spent the day at Legoland with the love of my life," tweeted the proud mom. "Happy bday Max!"

Happy birthday indeed.