Cassie‘s a new mom once again … welcoming her third child into the world … less than 2 weeks after testifying against her ex, Diddy, at his federal trial.

The singer-songwriter gave birth Tuesday in a New York City hospital … according to sources with direct knowledge. We’re told mother and child are healthy and doing well, despite arriving slightly earlier than her due date.

We broke the story yesterday … Cassie was rushed to the hospital yesterday and admitted into the labor and delivery unit.

Cassie first announced the news of her pregnancy back in February … sharing a heartfelt social media post with her two older kids — Frankie and Sunny — kissing her belly.

Cassie had all 3 of her kids with her husband, Alex Fine, who she married back in 2019 … about a year after she split from the disgraced music mogul.

As you know … Cassie’s legal battle with Diddy started when she sued him in November 2023, claiming he abused her. Diddy settled the lawsuit the very next day for an undisclosed amount — but during her testimony, earlier this month, we learned the settlement amount was $20 million.

Photos of injuries Cassie says she suffered at Diddy’s hand were entered into evidence too …  with bruises covering her back and legs.

Cassie’s baby bump was very prominent while she was on the stand for several days, and the judge made a point of limiting her time testifying … due to concerns she might go into labor.

Cassie’s lawyer, Doug Wigdor, told us after her testimony ended that Cassie was preparing to give birth to this child … focusing on her family after the long week.