Justin Bieber made somewhere between $500 million and $1 billion as the world’s biggest pop star, but he blew it all … and ended up being in such dire financial shape he had to sell his music catalog for $200 million.

TMZ has a new documentary, “TMZ Investigates: What Happened to Justin Bieber,” now available on Hulu, and part of our investigation digs into Justin’s money problems.

People on Justin’s side told us he was on the verge of “financial collapse” back in 2022 … so much so that he felt he had to sell the rights to his music that December.

We’re told Justin’s manager Scooter Braun tried to tell him it was a bad idea to sell so early in his career, and to at least wait until January 2023 to get a tax break … but Justin didn’t want to wait so he sold it in December.

Lots of artists have sold their catalogs, but Justin is by far the youngest to do it … and we’re told being broke had a lot to do with his decision.

Our Bieber documentary also explores Justin’s mental health, marriage, money troubles, his church and his career.

Longtime Reds announcer Marty Brennaman is thrilled Pete Rose is now eligible for the Hall of Fame — but he admits he’s still got a bone to pick with Major League Baseball … telling TMZ Sports the decision should have been made YEARS ago.

Brennaman — who called most of Rose’s memorable moments in a Cincinnati uniform — didn’t make many bones about it during a sit-down with us the day after Rob Manfred lifted Rose’s lifetime ban … explaining, “I just felt he had served his jail time, if you will, far longer than he really should have had to do it.”

“And,” Brennaman added, “the fact they rushed to make him eligible within in a matter of months to me was the wrong way to go about doing business.”

Brennaman made it clear that while he was happy it’s finally done, he wished Manfred would have just taken care of it while Rose was still alive.

“I’m just trying to reconcile in my own mind why they waited as long as they did,” he told us.