Jessica Simpson shared a photo of daughter Maxwell via Twitter on Saturday, Aug. 17: "Maxwell is crazy beautiful," she gushes Credit: Twitter

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.

"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.

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.

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.