JUSTIN'S DUI BUST -THE INSIDE STORY!

POP prince Justin Timberlake reeked of booze when New York cops busted Britney Spears' ex for DUI, insiders claim.

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The 43-year-old Sexy Back singer, dad of sons Silas, 9, and Phineas, 3, with actress-wife Jessica Biel, got pulled over by police immediately after leaving Sag Harbor's American Hotel in the ritzy Hamptons at 12:30 a.m. on June 18.

Officers say he was swerving across the road.