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Nicole Kidman has been leaning on her sister for support amid her split from Keith Urban

The actress and singer celebrated their 19th wedding anniversary in June

On Sept. 29, PEOPLE confirmed that the couple has separated

Nicole Kidman has been leaning on her sister amid her split from Keith Urban .

“Nicole’s sister has been a rock, and the entire Kidman family has come together to support one another," a source tells PEOPLE of the actress's sibling, Antonia .

PEOPLE confirmed on Monday, Sept. 29, that Kidman, 58, and Urban, 57, have separated after 19 years of marriage .

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