Credit: / Splash News

The Simpson family is taking over Cabo!

Ashlee Simpson wore an itsy-bitsy (black) polka-dot bikini in Cabo San Lucas, Mexico on Friday.

Accessorizing her sexy two-piece with a straw hat and shades, the recently divorced singer-actress and mom, 26, lounged by the pool with girlfriends and her dad, Joe Simpson. Also on hand for the Mexican getaway? Her beau Vincent Piazza and older sister Jessica Simpson.

The Simpson gals and Piazza were photographed lunching with another famous Cabo visitor, Nicole Richie, who is vacationing in the area following her 30th birthday bash last week.

And as her older sister bonds with Piazza, 26, during the holiday, Ashlee recently met her beau's family too; the Boardwalk Empire's parents flew to L.A. last weekend as he celebrated his show's Emmys nominations.

Richie and Jessica, 30, are costars on NBC's upcoming reality competition Fashion Star.