The former Spice Girl took to her Twitter on Thursday to share her baby joy with the world.
"Baby Harper is the most beautiful baby girl I have ever seen," she tweeted.
"I have fallen in love all over again!!!"
"We all feel so blessed and the boys love their baby sister so much!!!" The happy mom tweeted.
Harper Seven Beckham was born on Sunday, she joins big brothers, Brooklyn, 12, Romeo, 8 and Cruz, 6.