Rihanna and Chris Brown have not come out admitting that they are spending time together while both are in Europe, but sources have confirmed that the two singers have been spotted talking and spending some alone time together.

The two went on an intimate dinner at a restaurant in Monaco on July 25 and sources have said that they have been secretly spending time together for the past week, according to the New York Post.

In one instance, a source said, "Chris took a car at 4am to Port de Golfe Juan, then a tender to Rihanna's yacht and went straight to her cabin - re-emerging at 8am," according to The Sun.

On July 22, they spent all night talking while at a St. Tropez party on the Serene, a yacht owned by billionaire Yuri Shefler, the Post also reported. Fellow party guests included Leonardo DiCaprio, Kanye West and his girlfriend Kim Kardashian.

"They were clearly sparks flying between Rihanna and Chris. They spent a lot of the night in deep conversation," one source said. "It's clear things are very good between them again. They seemed happy to be together."

"Rihanna had her own yacht moored nearby," said another source. "And Chris had been visiting her. But they came over to The Serene Sunday to join Leo with Swizz Beatz and Ludacris."

Brown, 24, is shooting a music video along the French Riviera with hip-hop artists Ludacris and Swizz Beatz while Rihanna is in the area vacationing with friends.

Brown reportedly joined Rihanna during her stay in Sardinia, according to the New York Daily News, prior to joining Ludacris for their video shoot.

"He was probably there for two days," the newspaper said, adding that the eyewitness claimed to have seen Brown strolling with Rihanna and her entourage. "[She] doesn't want anyone to know that they are together."

Rihanna herself might have hinted to some kind of relationship with Brown through her posts on Twitter. The same day that Brown landed in St. Tropez by way of helicopter, Rihanna tweeted, "Touch down baby, help me pick out my fit" and all vacation long she has been posting "brooding shots of herself in repose to her 'baby' or 'boo,'" according to the Los Angeles Times.

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Rihanna, Chris Brown