Donald Trump Jr. has been caught locking lips with a Republican Palm Beach socialite – and it isn't his fiancée Kimberly Guilfoyle, DailyMail.com can reveal.

The former president's son was spotted canoodling with glamorous 'it girl' Bettina Anderson, 37, during an intimate brunch date last month - and sources tell DailyMail.com the romance is the talk of Palm Beach.

Exclusive DailyMail.com pictures show Don Jr.'s rendezvous with the model, influencer, and philanthropist at The Honor Bar, located inside Palm Beach's swanky Royal Poinciana Plaza shopping center on August 17.

Witnesses to the close encounter say it was clear this was no business meeting, with one revealing the blonde beauty was seen reaching over to plant a sexy kiss on Don Jr.'s lips three times.

'She seemed smitten with Don – and he with her,' the insider told DailyMail.com.

'They looked relaxed, she wearing a white shirt tied off to show her midriff and wide-leg pants, he in shorts and a t-shirt.'

At one point she also reached down below the table, put her hand on his thigh, and rubbed it, another source who witnessed the outing told DailyMail.com exclusively.

'They were definitely on a date,' the first witness said.

'They weren't exactly making out, but the kisses were romantic, and you could tell they were intimate with each other.'

A third person told DailyMail.com; 'I guess they're not trying to hide it. They've been seen together all over Palm Beach.'

Don Jr. was last seen with his 55-year-old fiancée at the MAGA Boat Parade in Palm Beach County on August 18, the day after his intimate meal with Bettina.

He has since been on the campaign trail helping his father's bid to regain the White House.

And certainly, it was clear that this was not the first time the couple had been to the bar.