It was another emotional night for Justin Bieber on Friday.

The 21-year-old pop star celebrated the launch of his new album, Purpose, with three intimate "An Evening With Justin Bieber" shows at Staples Center in Los Angeles. On stage, he held a Q&A session with fans in the audience, fielding questions like, "Will you marry me?" and "Are you happy?"

WATCH: Justin Bieber's 'Purpose' Show Goes On Following Paris Attacks

"I'm happy overall," he said. "I'm a little stressed out, but I'm happy. I'm just being honest."

When asked about his recent troubles over the past few years, the "Love Yourself" singer was open. "I just felt like I lost my place for a while," he admitted. "I lost my purpose, and I wanted to just be light and let people know that whether you don't feel like you have a purpose, whether you're just trying to figure it out, there's a light at the end of the tunnel."

It was towards the end of the concert that Bieber started to take everything in, choking up while performing "I’ll Show You." He was clearly moved by the crowd's support -- you could hear the emotion in his voice as he belted out the meaningful lyrics while lying on the stage with his legs crossed.

WATCH: Celebrity Showdown: Justin Bieber vs. One Direction

"Thank you, thank you," he said. "We're going to win this together."

Before walking off-stage, he thanked the audience once again, giving a big hug to his manager and friend, Scooter Braun. "Why am I crying so hard?" he asked himself. "I gotta get it together, Justin! We're doing this together, you know?"

See snippets from his performance and speeches below.

NEWS: Justin Bieber Says He Feared Turning Out Like Amy Winehouse

That wasn't the only emotional episode for Bieber that night. The singer learned of the heartbreaking attacks on Paris that killed more than 100 people, and during one of his three shows, he took the stage to say a prayer for the victims.

"Through all the pain and all the darkness, God, you still shine your light, God," he said. Hear the full prayer below.

WATCH: Justin Bieber Says Its Hard To Trust People: They've 'Hurt My Heart'

Following his concerts, Bieber took to Twitter to address the on-stage water works. "You guys just got me crying," he wrote. "Damn. I missed this and u. Thank u so much. Thank you. #EveningWithJB #Purpose."

Back in August, Bieber broke down in tears at the MTV Video Music Awards following his performances of "What Do You Mean?" and "Where Are U Now." Watch the video below to hear more.