Jessica Simpson has left fans in shock after sharing a picture of her nine-year-old daughter Maxwell looking so grown up.RELATED: Jessica Simpson shares adorable photo of daughter and is inundated with love in returnThe singer turned designer celebrated her youngest Birdie Max's third birthday with an incredible Barbie-themed bash but at one point took to Instagram Stories to share a snap with Maxwell, who wore a pair of cutoff jean shorts and a cropped white tank top.WATCH: Jessica Simpson's daughter Birdie steals the show in adorable family video from inside their homeThe two stood together in an oversized Barbie box with the phrase "you can be anything" written alongside it.Jessica kept in with the theme as well, rocking a Barbie-pink blazer and pink mini dress.READ: Jessica Simpson inundated with support from fans as she shares health updateMaxwell also wore drop earrings and had her blonde hair tied back with two small bangs hanging in her face.The young girl also posed with her younger siblings, including Birdie and brother Ace, who chose to wore all black. Maxwell looked all grown up "Birdie’s dream house party was tutu cute! I can’t believe our girl is 3! Thank you @balloonandpaper for mesmerizing all of us with stunning rainbow installations, and @xobloom for the gorgeous florals.