Lover Doll Jon’s latest stay over all-night companion….

As Hawaiian Eye (for the ladies) Jon Gosselin hooks up with yet another young "hottie" – a 23-year-old cocktail waitress who works weekends at his favorite bar, The ENQUIRER has learned exclusively.

She’s Stephanie Santoro, a single mom and aspiring model whose online resume says she’s willing to pose nude – and she spent the night with Jon, 32, in his garage apartment on the Gosselin family estate while his eight kids slept in the main house next door!

The hookup unfolded Saturday, Aug. 1, at Jon’s regular hangout, Legends nightclub in Reading, Pa.

"Jon arrived around 11 p.m. and spent a lot of time outside the club standing near his new BMW and talking to buddies," an eyewitness tells The ENQUIRER.

"When he went inside, he sat at a table with a group of people. Stephanie sat at the table at times, but she never sat next to him."

The club closed at 2 a.m., but Jon and Stephanie stayed inside, said the eyewitness.

"Around 2:45 a.m., the lights outside the club went out, leaving the area pitch-black. That’s when Jon and Stephanie, in a red top and shorts, left the club, jumped into his BMW and sped off," said the eyewitness.

About 15 minutes later, the couple pulled up at the Gosselins’ estate in Wernersville, and went into Jon’s garage apartment, according to the eyewitness.

At 7:15 a.m., Jon – star of TLC’s Jon & Kate Plus 8 – emerged from his garage hideaway.

"Jon came out of the apartment door carrying some luggage, and looked around to see if anyone was watching," said the eyewitness. "Then he started moving cars around, parking a dark Mercedes in front of the garage door."

Stephanie – wearing the same clothes she’d worn the night before – opened the apartment door and peeked out, said the source.

"Jon yelled something at her, and she shut the door," said the eyewitness. "He ran into the main house, and then came back to lock the apartment.

"When he came back, Stephanie walked through the garage and got into the Mercedes. Jon got into his white Nissan, and they drove off at the same time."

Another successful one night stand for the island born Lothario!

So far Gosselin has been linked to schoolteacher Deanna Hummel, 23; college dropout Hailey Glassman, 22, whose plastic surgeon father performed his estranged wife Kate’s tummy tuck; and so-called "star" reporter Kate Major, 26.

 "Jon is telling Hailey that she’s the one for him, and he’s just ‘pretending’ to be with other girls to ‘protect’ her," a source close to Jon divulged.

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