New mom Sofia Richie is going all out to celebrate her ... Sofia threw an outdoor garden party, and she shared pictures from the over-the-top event on her Instagram Stories over the weekend.

Sofia Richie is a mom! The 25-year-old model gave birth to her first child on May 20, she announced on Friday. Richie shares the newborn with her husband, Elliot Grainge, whom she married last April.

Sofia reposted the last photo ... Lionel Richie's 3 Kids: Everything to Know "I love Elliot," the "Hello" singer told Access Hollywood on April 26 shortly after his daughter's announcement.