The two, WHO split in July, hung out in the backyard with Their 3-year-old twins Max and Emme.
The night before, Jen dined at Casa Tua, while Marc performed at Miami's American Airlines Arena.
During his sold-out concert, the crowd's "Happy Birthday" to him, prompting a teary-eyed Marc to fall to his knees.
He thanked the audience for "all your love and support, ESPECIALLY this year; it means a lot to me," he said, According to People.
Gallery Pictures Jennifer and anthony reunite for his Birthday :