Jessica Simpson and Eric Johnson welcomed a baby boy, Ace Knute Johnson, and the couple reportedly named their newborn after Eric's paternal grandfather. 

Us Weekly confirmed the news about the happy couple after Simpson gave birth on Sunday in Los Angeles at the Cedars-Sinai hospital, via a scheduled C-section.

No photos or details about baby have been released, but sources said that the couple decided to name the newborn after Eric's grandfather, whose name is Knute Johnson.

However, Yahoo reported that Ace is becoming a popular "macho" name amongst parrents, adding that Simpson already gave her daughter a name ususally reserved for males: Maxwell.

"Ace has been a fast-rising name in the past decade, part of a new group of hyper-macho names like Cannon and Jett," Laura Wattenberg, from BabyNameWizard.com and NameCandy.com, said. "Ace is set apart from the others by a slight retro vibe, a holdover from the days when it was an acquired nickname like Duke or Buzz. It's an interesting choice for parents who gave their daughter the traditionally male name Maxwell."

While Jessica hasn't spoken out about her new addition as of yet, her father Joe Simpson took to Twitter to express his excitement about his grandson.

"Very blessed to celebrate the birth of my new grandson," Joe tweeted on Sunday.

The actress confirmed the sex of her baby back in March.

"The crazy thing is I never knew a wiener could make me nauseous," she said. "Well, I guess I just told the world that I'm having a boy!"

Simpson and Johnson got engaged in fall 2010, but were forced to postpone their wedding twice due to Simpson's back-to-back pregnancies.

"We've had two different wedding dates, but he keeps knocking me up," she said during an appearance on The Tonight Show with Jay Leno in January. 

In March, Jessica told Ellen Degeneres that her second pregnancy was much different than her first. 

"This pregnancy is the complete opposite," Simpson said. "Like with Maxwell, I felt amazing. Like I could do everything, eat everything. Do whatever I wanted. I had a lot of energy, this time around...I'm like exhausted. Eating Tums. That's my snack of choice."