The 20-year-old singer, who had an on-and-off relationship with singer-actress Selena Gomez, recently exchanged flirtatious messages with Yuvanna on Instagram, reported E!Online.
"I see you In that Dolce Dress. Glad u had fun. :)," Bieber wrote. After seeing his post, the 18-year-old model posted a shot of him posing in a suit at Cannes a few days ago, with the caption, "mcm (man crush Monday) looking great in that suit."
The brunette beauty, who has referred to Bieber as just a friend on the social networking site, last posted a shot of the Bieber with his arm around her earlier this month on Instagram.
The duo has been spending quite a bit of time since then, getting cozy and "acting like a couple" in Venice Beach after attending Floyd Mayweather's fight in Vegas, a source said.