Yahoo CEO Marissa Mayer has welcomed twin girls with her husband Zachary Bogue. The couple is already parents to 3-year-old son Macallister.

Mayer took to Twitter on Thursday to make the announcement, assuring everyone was doing fine.

“Zack and I are excited to announce that our identical twin girls were born early this morning,” she tweeted. “Our whole family is doing great! @zackbogue.”

USA Today reports Mayer revealed she was expecting twins in September on Yahoo’s Tumblr page.

Throughout her pregnancy, much like with her son, Mayer took “limited time away” from work. A day before she gave birth, she held a press conference announcing a company turnaround.

She's expected to take a short maternity leave, which is a hot topic in recent months.