June 19, 2008 11:15 AM

Britney Spears has arrived at the Mississippi hospital where her sister Jamie Lynn is expected to give birth to her first child today.

On Wednesday, Britney – along with her father Jamie and brother Bryan – arrived in her hometown of Kentwood, La., to be with Jamie Lynn. Mom Lynne has also been with Jamie Lynn, helping prepare for the baby’s arrival.

The Spears family spent a relaxing evening together in Liberty, Miss., where Jamie Lynn recently bought a home, the night before. “They have had nine months to deal with this,” says a Spears family friend. “Last night was very low-key. There was no last-minute panicking. No one was worried.”

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