The fashion designer took to Instagram on Tuesday to share a brand new photo of her daughter, Birdie Mae Johnson. In the black-and-white pic, the 3-month-old baby smiles at the camera, showing off her adorable dimples.
"Today is a good day ? #BIRDIEMAE," Simpson captioned the pic. The blonde beauty shares Birdie -- as well as 7-year-old daughter Maxwell and 6-year-old son Ace -- with her husband, Eric Johnson.
Fans and fellow celebs couldn't help but gush over the little one in the comments. "?????LOVE HER!!!!!," Cacee Cobb wrote.
"Always a good day with birdie Mae!" Odette Annable added, while Ken Paves commented with a hello to the baby girl.
Simpson celebrated Ace's birthday just days earlier. "Happy Birthday to my 6 year old Ace!! You are the sweetest, most incredible, warrior son in the universe. I am so proud to be your mommy! I love you X INFINITY ?? #ACEKNUTE," she captioned a cute snap of her son.