Yahoo CEO Marissa Mayer Gives Birth to Identical Twins

— -- Marissa Mayer has given birth to identical twin daughters.

The Yahoo CEO tweeted today that she gave birth early this morning.

"Our whole family is doing great!" she said.

The Yahoo CEO, 40, shared on her Tumblr in September that she and her husband Zack Bogue were expecting, writing that the "twins part was quite a surprise, because I have no family history of twins or any other predisposing factors."

"Since my pregnancy has been healthy and uncomplicated and since this is a unique time in Yahoo’s transformation, I plan to approach the pregnancy and delivery as I did with my son three years ago, taking limited time away and working throughout," she wrote.

Mayer was back to work soon after she gave birth to her son in 2012, the same year she took over as Yahoo's CEO.

"I've shared the news and my plans with Yahoo’s Board of Directors and my executive team, and they are incredibly supportive and happy for me," she said. "I want to thank them for all of their encouragement as well as their offers of help and continued support."