It's the first time 18-year-old Jamie Lynn, who welcomed daughter Maddie in June 2008, has shown off her post-baby body. "She had on a white, spangly top," the witness says. "A very little bikini!"
The family, including Sean Preston, 3, and Jayden James, 2, "sat around the pool for about 20 minutes," the witness says. "Then Britney worked on her tan while Jamie Lynn took her daughter and her mom to a cabana on the beach.
"They seemed pretty relaxed. Everyone was smiling," the witness goes on.
When the weather became overcast around 2 p.m., the family headed inside for lunch, the witness says.