"Just took Easter to a whole new level welcoming my soul sister Angi's new bundle of joy, Alakai Lion ??? And the family grows… #HappyEasterEveryone," the 37-year-old actress captioned the pic.
The image additionally includes Kate's sister-in-law Erinn Hudson. Erinn tied the knot with the How to Lose a Guy in 10 Days star's older brother, Oliver Hudson, in 2006 and the couple are now parents to three kids together.
Later on Sunday, Angi — who is Kate's personal trainer and close friend! — posted a photo of herself with baby Alakai, her older son, and husband.
Kate with her two sons, Ryder and Bing.
"God's greatest gift and another reason to give Him all the glory for this most amazing holiday of Grace, miracles, and eternal life ???? Thank you everyone for all of your prayers and support during this time. We are so in love," she captioned the family photo.
Kate is similarly a mother to two boys. She previously welcomed son Ryder Robinson, 13, in Jauary 2004 with ex-husband Chris Robinson and son Bingham Bellamy, 5, in July 2011 with ex-fiancé Matt Bellamy.
Check out the gallery to see a guide to Goldie and Kate’s extended family!