Singer breaks down on stage in Philadelphia

Why did Justin Bieber broke down into tears again during his Philadelphia tour on Saturday night May 7?

The pop star got emotional while performing his hit song, Purpose and while fans continued to scream in excitement, the Biebs couldnt help but shed some tears.

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In his interview with Billboard magazine last November, the 'Sorry' singer claimed he had written the song - 'Purpose' - for his big man move. So was he crying out of regret for things he's done in his "younger" years?

Well, for the star who just got a new facial tattoo, Bieber could be having a lot to regret about - like his strained relationships with his mother, Pattie Marlette and ex-girlfriend, Selena Gomez!

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Bieber said in Billboard magazine interview, he caused the rift between his mom and himself and would do everything to make amends. He called their relationship "pretty non-existing."

So, just a quick question: when will Bieber stop crying on stage?

Watch Justin Bieber's emotional performance in Philly below: