Jessica Simpson and Eric Johnson.
Singer Jessica Simpson with Eric Johnson. http://www.weddingfashioning.c

Maxwell Johnson became a big sister on Sunday when Jessica Simpson gave birth to a baby boy. Simpson and fiancé Eric Johnson named their son Ace Knute, a representative for the Simpson told The Hollywood Reporter. According to the celebrity news site, the baby’s middle name is pronounced ka-nute, and it's apparently the name of Johnson’s paternal grandfather, who is Swedish.

“Jessica, Eric and Maxwell are thrilled to welcome the new addition to their family,” Simpson’s rep told Us Weekly. Baby Ace was born via a scheduled C-section in Los Angeles, the news site added.

The singer-turned-fashionista Simpson, 32, and her NFL star beau, Johnson, 33, already share 14-month-old Maxwell together. Simpson revealed she was pregnant with baby number two in November when her daughter was only seven months old, Us Weekly reported. A few months later, in February, the “Irresistible” singer said she planned to name her baby “Ace,” but she didn’t confirm the child’s gender.

A month later, the famously absent-minded starlet let slip that she was having a boy during an appearance on ABC’s “Jimmy Kimmel Live,” THR wrote. "I just feel awful, I've been vomiting," she said. "The crazy thing is, I never knew a wiener could actually make me nauseous." After catching herself, she added: "Well, I guess I just told the world I'm having a boy."

Kimmel quipped back, as if he didn’t realize what Simpson had said: "Oh, I didn't even know it was that. I thought maybe you were having a girl with a penis.”

Having a boy the second time around wasn’t the only difference the 32-year-old experienced with this pregnancy. "This pregnancy is the complete opposite," Simpson said during an interview with Ellen DeGeneres, Us Weekly reported. "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."