Jennifer Lopez, 54, flaunts her age-defying physique in a tiny black Valentino bikini in sexy clip from her birthday party

George Clooney, Meryl Streep, Jennifer Lopez and More Stars Donate $1 Million Each to SAG-AFTRA Foundation

George Clooney, Meryl Streep, Jennifer Lopez and More Stars Donate $1 Million Each to SAG-AFTRA Fund

Jennifer Lopez keeps it casual as she goes shopping with husband Ben Affleck in The Hamptons - after her fun-filled 54th birthday bash