Jennifer Lopez has a close-knit family, and over the weekend she marked a special celebration with them.MORE: Jennifer Lopez makes bold move regarding Ben Affleck relationshipThe star's niece Lucie turned 13 and was joined by her famous aunt and cousins as she marked her big day in New York.J-Lo's daughter Emme was among those who attended Lucie's birthday party and was pictured on Instagram at the event. VIDEO: Are Jennifer Lopez and Ben Affleck back together for good?Journalist Lynda Lopez