Notorious womanizer MAT LAUER may have some new explaining to do to his long-suffering wife, Annette Roque!

Exclusive photos obtained by The ENQUIRER show the skirt-chasing “Today” show host relaxing on his boat with a mystery blonde in New York’s glitzy resort area, the Hamptons, on July 8.

An eyewitness told The ENQUIR ER that Matt and the woman “acted suspicious” after they noticed a photographer snapping their picture.

“If they didn’t have anything to hide, then why did the girl duck and try to cover her head to avoid being photographed?” said the eyewitness.

“Matt also acted like he’d been busted. After spotting the photographer, he quickly pulled his boat up to the dock and dropped the lady off before gunning the boat back out onto the water.

“He acted like he couldn’t get her off the boat fast enough!

“Certainly, with his reputation as a womanizer, Matt is going to have some new explaining to do to Annette.”

The eyewitness said Matt’s boat ride with the woman lasted about 20 minutes, and described the NBC morning anchor’s gal pal as a “smoking hot blonde…”

FOR ALL the details and to SEE the pictures everyone’s talking about – it’s ONLY in the new ENQUIRER – on sale now!