While Justin Bieber didn't get to hang out with girlfriend Selena Gomez on her 19th birthday earlier this month, the singer did show his dedication and commitment to her by making an appearance at his lady love's Thursday night show in Boca Raton, Florida, which was held at the Mizner Park Amphitheater.

During her performance,  Gomez brought the house down, performing songs from her new album, 'When the Sun Goes Down,' and Bieber was probably beaming with pride while watching his lovely lady. He's such a good BF, showing his support by coming to see her perform. Plus, being a performer himself, he can relate to the lifestyle and the gig.

Unfortunately for teen pop fans, The Biebs was merely a spectator at this show and did not venture on stage for an impromptu or improvised song with Gomez. He did take in the show with singer Sean Kingston, who lives in the area and tends to show up at the shows of fellow pop stars, like he did last week. Plus, Sean tweeted yesterday about Bieber visiting him.

We're left to wonder why Gomez and Bieber don't perform together once and for all. We'd love to hear them duet and we're sure their fans would dig it, too! They've been a public couple for quite some time and it only makes sense that they should perform together and not in karaoke fashion. Or maybe they are planning something huge for the future, in terms of signing together? Wouldn't that be uh-mazing?

Watch Selena Gomez Perform a Britney Spears Medley from the Boca Raton Show