08/18/2013 11:08 am ET Updated Aug 19, 2013

Christie Brinkley, Alexa Ray Joel Pose In Bikinis

Christie Brinkley and her daughter Alexa Ray Joel looked more like sisters as they vacationed in the Hamptons this weekend.

The 59-year-old model and her 27-year-old daughter posed in bikinis while fishing near Montauk, N.Y., taking to Instagram to share some sexy snapshots.

In the pics, Joel -- Brinkley's only child with ex-husband Billy Joel -- rocks a tiny white two-piece while her mom dons a bikini top and navy blue shorts. The duo was also joined by Brinkley's son Jack.