05/12/2012 AT 4:25 PM ET
“She is insanely beautiful,” Simpson, 31, gushes on Twitter. “I can t help but play dress up!”
Simpson’s lists head décor as her favorite way to give the baby some extra flare.
“I’m addicted to buying headbands with massive flowers for Maxwell,” she writes.
But that’s not all.
“The baby is wearing different outfits every second,” a Simpson friend tells PEOPLE, adding that she has “a ton of” hats and onesies.
For more on Jessica Simpson’s life as a new mom, check out the latest issue of PEOPLE, on newsstands now