Christie Brinkley and daughter Alexa Ray Joel, from her second marriage to singer Billy Joel, showed off their sexy mother-daughter bikini bods on Friday afternoon during a fishing trip they took near the supermodel's home in Sag Harbor, New York.

The two area natives looked more like sisters than mother and daughter, with the 59-year-old supermodel showing off in a striped bikini top and blue shorts, while Alexa, 27, flaunted her sexy curves in a white two-piece.

Brinkley's son Jack, from her third marriage to real estate developer Richard Taubman, was also along for the trip, along with some family friends.

The former Sports Illustrated Swimsuit Issue covergirl took plenty of photos of her kids with their catch of the day, writing "Jack caught a DOORMAT!" with the image of her son with his giant fluke, and "Alexa caught a fluke and threw it back .. The fish is fine ... (and so is the weather!)".