Nicole Kidman explains why arrival of baby Faith was kept secret

She and husband Keith Urban had their daughter Sunday Rose the old fashioned way, but Nicole Kidman decided to use a surrogate to carry her newborn girl Faith Margaret.

And the "Others" actress and her country crooner are both over the moon at the arrival of their latest family  addition.

As to why she only recently let the good news leak (Faith was born on December 28), Nicole explained, "I wanted to be able to tell everybody because I was so excited about her. But at the same time we just decided that this was about being together."

And when asked about the baby's name, Kidman declared, "We needed to have that through the whole pregnancy. That's what it required -- a lot of faith."

Faith Margaret was born at The Women's Hospital at Centennial Medical Center in Nashville, fulfilling the "Moulin Rouge" actress and the "Days Go By" singer's dream of having another child.

An inside source told press, "They never gave up faith they'd have another child together. They feel blessed."

Little Faith joins her big sister Sunday Rose, as well as Kidman's adopted kids Connor and Isabella from her marriage to Tom Cruise.

Speaking to Access Hollywood, the Aussie actress revealed that her 2-year-old daughter is thrilled to have a little sister.

"She's so into [Faith] and she's crazy about her," Nicole said. "We really wanted Sunday to have a sibling, you know, so, so now we've got Sunday and Faith Margaret...we've got our hands full! We're really happy."

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