Jessica Simpson is a doting mom to three young children, and earlier this week, the star shared a picture of her eldest child Maxwell Drew, and it melted hearts.MORE: Jessica Simpson's $11.5million family mansion is another levelIn the adorable black-and-white snap, Maxwell, nine, was cuddling up with the family's pooch, Penny Lane.WATCH: Jessica Simpson's daughter Birdie steals the show in adorable videoAlongside Maxwell, Jessica is also mom to son Ace, seven, and daughter Birdie, two.Jessica