Marc Anthony (left) and Jennifer Lopez
09/19/2011 at 10:00 AM EDT
He celebrated with close friends – and thousands of fans – Friday in Miami, and on Saturday, Marc Anthony had a quiet birthday celebration in Miami Beach with estranged wife Jennifer Lopez
and their 3-year-old twins, Max and Emme.
"It looked like a fun family gathering at the pool," a source tells PEOPLE. "Everyone looked happy and festive."
Anthony, who turned 43 on Friday, and Lopez were at entrepreneur friend Loren Ridinger's guesthouse, which is where the two often stayed before they acquired a condo at Miami's Viceroy Hotel complex.
The night before, Anthony headed to Club 50 at the Viceroy for a birthday bash after his concert
at the American Airlines Arena. Lopez, meanwhile, was having dinner at Casa Tua in South Beach.
She is also expected to continue filming Parker
, alongside Jason Statham, this week.
Anthony and Lopez were previously spotted together in August
in Southhampton, N.Y.