Jennifer Lopez is expressing her love for hubby Ben Affleck by sharing a sweet snapshot into their private life. The «Ain't Your Mama» singer took to Instagram on Tuesday to commemorate Affleck's 51st birthday, and shared an adorable video she recorded while in the passenger seat of their car — as the birthday boy drove around town.While on the road, Lopez beamed as she and Affleck lip synced and danced to Sam Cooke's iconic love song «Wonderful World.»The pair got into the tune, with Lopez smiling brightly to the lyrics, «Don't know much about the French I took/ But I do know that I love you/ And I know that if you love me, too/ What a wonderful world this would be.»«Dear Ben … Happy Birthday.