LeBron James and Savannah Brinson
01/02/2012 at 11:00 AM EST
had more on his mind than just ringing in the new year on Saturday night.
At a New Year's Eve
dinner and party at SL nightclub at the Shelborne hotel in South Beach, the Miami Heat star
, 27, proposed to his longtime girlfriend Savannah Brinson. And he got their kids in on the action as well.
Right after popping the question, James picked up the couple's sons LeBron Jr., 7, and Bryce, 4, and swung them around on the floor. "It was so sweet to watch," a rep for Remy Martin V, who hosted the dinner, tells PEOPLE. "Everyone is extremely happy."
The party, hosted by Heat teammate Dwyane Wade and his girlfriend Gabrielle Union, was also a belated birthday celebration for James, who turned 27 the day before.
Heat star Chris Bosh
and Queen Latifah
were also on the guest list of 60 friends and family members.
"When it happens, it happens," Brinson, 25, told Harper's Bazaar
of marriage in 2010. "If we do it, I want it to be forever."