Victoria Beckham: Harper Seven "Is the Most Beautiful Baby Girl" Ever!

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Victoria Beckham can't help but fawn over her newborn daughter Harper Seven.

"Baby Harper is the most beautiful baby girl I have ever seen," the 37-year-old fashion designer tweeted Thursday. "I have fallen in love all over again!"

Already a mom to sons Brooklyn, 12, Romeo, 8, and Cruz, 6, "we all feel so blessed, and the boys love their baby sister so much," she added.

Born at 7:55 Sunday morning at Cedars-Sinai Hospital in L.A., the Beckhams' first daughter weighed in at 7 lbs, 10 oz. "Her brothers are delighted to have a baby sister," Victoria's husband David, 36, told his Facebook fans.

Why did the A-list couple choose such a unique name for their latest addition? "Harper is an old English name that [Victoria] has always liked," a source recently told Us Weekly. "Seven is a very spiritual lucky number. She was born in the seventh month, in the seventh hour."