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Justin Bieber, Selena Gomez

SPW / Splash News

In addition to their musical rendezvous on Friday, Selena Gomez and ex-boyfriend Justin Bieber also engaged in some pseudo-PDA action.

The had reunited that night in Beverly Hills, at a hotel bar, where the Biebs, 21, proceeded to sit at the piano and serenade his ex with a rendition of "My Girl." He and Gomez, 23, also slow danced in front of the small audience that gathered.

That night, they were also spotted strolling together in town. Gomez was seen putting her left hand on Bieber's shoulder as they walked.

Bieber and Gomez dated on and off between early 2011 and late 2014. They have not commented about their Friday night together.

Later that night, Bieber was seen at a restaurant and nightclub at nearby West Hollywood, where he met up with longtime friend Kylie Jenner, 18, who was partying with friends. The two later traveled together to another club.