Just two months after their daughter, Maxwell, celebrated her first birthday, Jessica Simpson and fiancé Eric Johnson had another big reason to celebrate: they welcomed son Ace on June 30. Though the Fashion Star mentor had initially planned to keep the sex of her baby a secret, she let slip that she was expecting a boy on Jimmy Kimmel Live in March. "I'm so excited to have a son," she told PEOPLE in April. "I didn't grow up with a brother and I think the unknown is really exciting. I can't wait to have that connection with our little man." Also born this month: Kim Kardashian and Kanye West's first child, daughter North; and Shannon Miller's second child, daughter Sterling.