Figuring out how to celebrate the birthday of your significant other for the first time is a daunting task for most any couple.

So imagine if you were dating Jennifer Lopez.

Still, Casper Smart did his best to impress his leading lady tonight – blindfolding the singer and leading her to a surprise party on a luxury yacht for her 43rd birthday extravaganza.

Surprised, honey? Casper Smart revealled his birthday surprise for girlfriend Jennifer Lopez as the couple celebrated her 43rd in New York this evening

The big reveal: Casper held a colourful scarf over Jennifer’s face before revealling what the fuss was all about

The couple, who were loved-up in New York earlier in the day, changed into their party clothes for a night out on the town.

Only Jennifer wasn’t expecting – or at least, wasn’t supposed to be expecting – the dancer had booked a boat for the occasion.

Stepping out of their hotel, the singer looked stunning in a long sleeve Tom Ford zipper dress in a striking shade of orange.

The detail, which revealed her toned back, brightened Jennifer’s radiant complexion.

Stunning: The singer sizzled in a backless Tom Ford zipper dress in a striking shade of orange-red

Sexy star: Jennifer showed off her toned back as Casper led her into their car

Not forgetting her fans: Jennifer flashed a smile to photographers

The surprise: Casper had booked a yacht for the very special occasion

The fashionable star teamed a matching pair of orange and clear stilettos with the ensemble, with accents of gold jewellery, including a pair of hoop earrings that blended in with her wavy honey blonde locks.

Casper, in a burgundy blazer and black pants, covered the singer’s face with a colourful scarf as he led her out to the harbour in uptown Manhattan.

And while Jennifer looked somewhat in awe, her face seemed to hint she may have had an inkling as to the plans her toy-boy had been making.

What gentlemen: Jennifer grabbed the shoulder of a man leading the way on board as Casper followed behind

Time to party! The star stepped on board to greet dozens of friends who came out in her honour

Thank you baby! Jennifer seemed genuinely appreciative as she spoke with her boyfriend surrounded by balloons and friends

It’s her night: The singer flashed a smile as she spoke to another person on board

Earlier in the day, Casper was seen organising the event on board the yacht, telling planners where to put a large photo of his American Idol as a little girl, posing innocently in a maroon dress and with a winning smile.

The choreographer, who is 18 years Jennifer’s junior, wouldn’t have even been alive when the intimate snapshot was taken.

Dancing queen: Jennifer showed off her moves as she boogied with Casper on the deck at the party

Hilarious! Jennifer looked delighted with her huge bear birthday cake

Smiles all round: Partygoers snapped photographs of the birthday girl as she posed up with the cake