(Photo: Kelly Osbourne Instagram) 

Kelly Osbourne was basking in motherhood after welcoming her first baby with boyfriend Sid Wilson in 2022.

During a recent episode of 'The Osbourne's Podcast,' she spoke openly with her father Ozzy Osbourne and mother Sharon, revealing that she and her Slipknot beau experienced their "biggest disagreement" yet after he refused to double-barrel their son's last name.

"This is personal, and I didn't expect to ever talk about this, but I'm going to," she began. "It's the biggest fight me and my baby's father have ever, ever, ever had, and probably ever, ever will."

The 39-year-old admitted the discussion regarding her son Sidney's last name has caused a rift between the two, although she understood his perspective seeing as though Wilson, 46, "comes from a really traditional English family."

(Photo by Rachpoot/Bauer-Griffin/GC Images)

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"I wanted our son to have both of our last names, and he wouldn't let me," she said. "We had a huge fight. I feel that I was forced into doing something I didn't wanna do."

"So right now my son doesn't have a double-barreled last name, but after lots of eye-opening conversations and some couples therapy, he has seen the light," she continued. "We are going to legally change our son's name to have both of our last names. We both made our child, so he should have both of our last names."

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In January, the former 'Fashion Police' host told 'Rolling Stone' that she was proud to be a nepo baby and couldn't be more proud of her parents' achievements.

"I think that what they have done is incredible, history-making," she started. "I go so far as to say both of them are iconic."

It's no surprise that the new mother is proud of the family name and will do what it takes to carry it on.

The former lead vocalist of legendary group Black Sabbath continued: "Well, it's in his favor," to keep their family name, something her mother, Sharon, 71, agreed with.