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Justin Bieber cries at album playback

Justin Bieber burst into tears on stage at his album preview event whilst opening up about his struggles over the past few years.

The "Yummy" hitmaker gave an emotional speech at the event to launch his upcoming LP, "Changes", in Hollywood on Thursday and opened up about his struggles over the past few years, which have included him battling depression and being diagnosed with Lyme disease.

Speaking at the playback held at Village Recorders in West Los Angeles this week, he admitted: "I don't even think I should be alive never mind thrive."

The 25-year-old pop star took the time to thank those closest to him for sticking by him and supporting his career, including his long-time manager, Scooter Braun.

Speaking of the record executive, he said: "You walked with me through a lot of s**t."

The "Sorry" hitmaker also declared his love for his wife Hailey Bieber - who he tied the knot with last year - and gushed about how he is "so proud" of where he and the 23-year-old model are at in their relationship.

The tearful singer said: "I love you with all my heart ... and I'm so proud of us."

But Justin then tried to gather his emotions together.

He quipped: "I've gotta get it together.

"I'm gonna go shoot myself."

The candid talk also saw Justin open up on how his music is deeply personal and thanked his fans for "loving" him " at his "worst".

He said: "There's power in weakness."

And, he added that it's "a reflection of that ... thank you for loving me at my worst."

The album preview event comes after the "Love Yourself" hitmaker revealed he will be delving into his battle with Lyme disease - an infectious condition which is spread by ticks -further in his upcoming YouTube documentary series, "Justin Bieber: Seasons".