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Jessica Simpson Gives Birth to a Baby Boy!

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Jessica Simpson (FameFlynet)

Jessica Simpson is officially a mother of two!

The "Fashion Star" mentor and fiancé, Eric Johnson, welcomed a boy named Ace Knute on June 30 in Los Angeles via scheduled C-section.

"Ace Knute (pronounced Ka-nute) Johnson has arrived! Mom and baby are doing great," her rep told Us Weekly. "Jessica, Eric, and Maxwell are thrilled to welcome the new addition to their family."

[Related: All the Adorable Details From Jessica Simpson's Baby Shower!]

The couple is already proud parents to daughter Maxwell, who celebrated her first birthday on May 1.

Simpson, 32, let it slip during an appearance on "Jimmy Kimmel Live" in March that she was having a son. When discussing how her first pregnancy was easy in comparison to the second time around, she said: "The crazy thing is I never knew a wiener could make me nauseous!"

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Jessica, Eric Johnson, and their daughter Maxwell (PacificCoastNews.com)

Realizing her gaffe, a flustered Simpson cracked, "Well, I guess I just told the world that I'm having a boy!" She added that her announcement was unplanned.

Also unplanned? The second pregnancy, which threw a wrench in Simpson and Johnson's wedding plans — the couple began dating in May 2010 and got engaged in November that same year.

"We've had two different wedding dates, but he keeps knocking me up. We're doing it backwards," Simpson explained on "The Tonight Show With Jay Leno" in January. "I'll just keep my legs crossed, I guess, this time. Apparently it was part of God's plan for my life."

Sources tell omg! that Simpson and Johnson "won't wait too long" to tie the knot now that she has given birth to little Ace.

"Jessica can't wait to be Eric's wife," our source says.

Check out other stars who have had back-to-back babies:

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