Sunday Rose Urban received some top secret visitors shortly after her July 7 birth — her adopted half-siblings Isabella and Connor Cruise!

OK! has exclusively learned that Nicole Kidman‘s oldest children, adopted as babies during her 10-year marriage to Tom Cruise, flew to Nashville, Tenn., to meet their baby sister late last month.

"Connor and Bella don’t see that much of their mother," an insider tells OK!. "But everyone felt it was important for them to meet their new sister."

Meanwhile, in their native Sydney, Australia, Nicole, 41, and husband Keith Urban, 40, have been introducing Sunday to their family and friends, including Hugh Jackman, who visited Aug. 10.

"She lives in Nashville — part of her is in Australia. She is centered," Nicole’s stylist Phillip Bloch tells OK!. "People think of her as cold, but she’s not that way at all."

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