Britney Spears, Jamie Lynn Spears

Kevin Mazur/, Darby Shaw/

Britney Spears is back in big-sister mode.

The pop star and her dad, Jamie, are ready to hop a flight at a moment's notice to be by pregnant Jamie Lynn Spears' side in Mississippi, sources tell E! News.

The 17-year-old, who's expecting her first child with fiancé Casey Aldridge, 19, is due to give birth any day now.

“Jamie and Britney are standing by to get a call and when they do, they are jumping on private jet,” a source said.

Sources say Jamie Lynn was scheduled to deliver naturally, but may opt for a C-section for health reasons.

Britney’s court-appointed lawyer, Samuel Ingham, announced at this morning’s probate hearing regarding Spears’ conservatorship that the pop star will be out of town until next Monday.

The "...Baby One More Time" singer had reportedly been somewhat estranged from Jamie Lynn but, on May 3, she flew back to her hometown of Kentwood, La., to attend her little sis' baby shower.

—Additional reporting by Lycia Naff

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