(CNN) Cameron Diaz and Benji Madden are new parents.

The couple shared the happy news on their official Instagram accounts with the same post.

"Happy New Year from the Maddens! We are so happy, blessed and grateful to begin this new decade by announcing the birth of our daughter, Raddix Madden," their note read. "She has instantly captured our hearts and completed our family."

Their new daughter "has instantly captured our hearts and completed our family," they wrote.

Diaz and Madden, who generally avoid the spotlight together, also plan to be very private about their new family member.

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