Sunday Rose Kidman Urban, carried by mom Nicole Kidman, made her public debut at Kingsford Smith Air Base in Sydney, Australia on Wednesday.

Sunday Rose Kidman was born on July 7, and already she is at the center of a mystery. Her name seems unconventional, but there’s a story behind it. Kidman’s father Antony told Australian newspaper The Daily Telegraph:

"I have read a bit about Sunday Reed and her husband John - she was a key mover and shaker in the arts around the beginning of the century. The name Sunday struck me as being a nice name for a woman, so my wife and I mentioned it."

Sunday Reed was famous for her patronage of the arts, but also for her relationship with Sidney Nolan. Reed and her husband took part in a menage-a-trois type affair with the artist, which lasted nine years in the 1930s and resulted in Sunday becoming Nolan’s muse.

The connection could be the reason behind Nicole Kidman and Keith Urban’s keen interest in a Sidney Nolan exhibition at the Art Gallery of NSW shortly before they announced the pregnancy.

The exhibition, in January, featured a quote about birth from Nolan which was scrawled across a wall. "When you are young you are given a good view of life, because of your closeness to birth," it read.

Kidman appeared mesmerised by this quote, staring at it for a long time before Keith wrote it down.

"It was among other names being mentioned but they decided that was the name they wanted," Dr Kidman said.

Urban’s brother Shane could not contain his excitement as he spoke to a Sunshine Coast radio station, revealing the baby’s second name was a tribute to their late grandmother Rose.

"It’s a wonderful wonderful thing, I’m so, so proud," he said.

Kinky.

Nicole Kidman (41) gave to birth today to a baby girl named Sunday Rose Kidman Urban. The baby weighed 6 pound, 7 ounces. Paul Freundlich, a publicist for Keith Urban (40), said:

"Nicole and Keith Urban are delighted to announce that Nicole Kidman gave birth to a baby girl on Monday morning, July 7, 2008, in the United States. Sunday Rose Kidman Urban weighed 6 pounds, 7 1/2 ounces. Husband Keith was by Nicole’s side and mother and baby are very well."

Urban posted a message on his Web Site that said:

"Earlier this morning Nic gave birth to our beautiful baby girl, Sunday Rose Kidman Urban. We want to thank everybody that has kept us in their thoughts and prayers. We feel very blessed and grateful that we can share this joy with all of you today."

CONGRATS!