Justin Bieber is heading to the Hamptons.

We hear the pop star has rented a $5 million, five-bedroom home in Montauk for $375,000.

We’re told the “Intentions” singer is planning to stay at the pricey Old Montauk Highway pad — which includes ocean views and a pool — for three weeks, from the end of July to the middle of August. The house was not on the market, says a source, and the owners agreed to move out to let the Biebs have the space.

Sources say the lease was negotiated by Nest Seekers’ Dylan Eckardt, a celebrity real-estate agent known as the Prince of Montauk.

A rep for Bieber tells us our story is “false.”

Eckardt also allegedly found Rihanna a $415,000 place in Sag Harbor for mid-July to mid-August.