A. Ariani/Splash News Online
Maggie Coughlan
July 25, 2012 01:35 PM

Jennifer Lopez proves you’re never too old for a surprise party.

The blindfolded singer, who celebrated her 43rd birthday Tuesday, was all smiles as boyfriend Casper Smart, 25, guided her to a surprise soiree aboard the Utopia II Superyacht in New York City.

In form fitting red-orange backless Tom Ford dress, Lopez greeted the dozens of guests aboard the luxury liner.

Jennifer Lopez
JT/Bosch/INF (2)

The couple, whose passionate moves can be seen in the music video for “Dance Again,” clasped hands and took the dance floor, showing off their moves.

Lopez couldn’t hide her delight when a cake in the shape of a giant pink teddy bear was brought out. “Happy birthday BEAR!” it read. (The couple call each other “bear.”)

Smart Tweeted Tuesday, “(yelling) HAPPY BIRTHDAY TO THE MOST BEAUTIFUL BEAR IN THE WORLD!!!!!!!!!!!!!!! LOVE U.. ‘) @JLo.”

Lopez replied, “@BEAUcasperSMART LOL!! Thank You my sweet Bear!!!!!!!!!!!!!!!!!!!!!!!!!!!!!”

Earlier in the afternoon, Lopez’s children, Max and Emme, 4, were spotted exploring the yacht with their grandmother, Guadalupe.

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