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 Jonathan Cheban, Anat Popovsky

While Kim Kardashian continues to lay low in L.A., her BFF Jonathan Cheban and his girlfriend Anat Popovsky have just returned from their overseas end-of-summer vacation in Europe.

The couple hit several high-end hotspots during their getaway, including Rome, Sardinia, Monaco, Cannes and St. Tropez, a source reveals to E! News.

"They had a blast," the source says. "The trip brought them even closer together. They're going strong right now."

In a pic of the couple snapped during their visit to the St. Tropez Polo Club, the lovebirds looked uber relaxed while strolling around the grounds.

The couple, who met in Florida over the winter while Cheban was filming Kourtney & Kim Take Miami, left for their romantic European getaway on Aug. 27.

"Lately, things have been getting serious. They're together all the time. Where he goes, she goes," a source told E! News. "Kim has met her and really likes her—and she's very picky when it comes to who dates her best friend!"

Jonathan and Anat are currently in the Big Apple for the tail end of New York Fashion Week and will then head back to L.A., where Jonathan's likely due back to start filming season nine of Keeping Up With the Kardashians.