"Big sister Maxwell Drew is growing up! Jessica Simpson shared a picture of her and fiance Eric Johnson's 15-month-old daughter Maxwell via Twitter on Saturday, Aug. 17, admiring how stunning her little tot is becoming. PHOTOS: Jessica Simpson's body evolution "Maxwell is crazy beautiful," the 33-year-old singer simply wrote. Sitting on a wood floor and holding an Aden + Anais muslin swaddle blanket, Simpson's eldest child wore a pink cupcake t-shirt and white shorts. Looking up at the camera with her baby blue eyes, Maxwell pouted her lips and showed off her gorgeous blonde locks. PHOTOS: Jessica's maternity style Two months earlier, the former Fashion Star Show judge shared another photo of her little mini-me via Twitter. Dressed in a long sleeve pink shirt with an elephant and heart design, Maxwell wore white sunglasses for a pose in June. PHOTOS: Maxwell's baby album Maxwell was joined by younger brother Ace Knute, almost 2 months, in June. Ace was born in Los Angeles via scheduled C-section but has yet to make his very own debut. This article originally appeared on Usmagazine.com: Jessica Simpson Daughter Maxwell Photo: Toddler Shows Off Blonde Locks"