Yahoo’s Marissa Mayer expecting twins

Yahoo CEO Marissa Mayer speaks at the company's first mobile developer conference at Nob Hill Masonic Center in San Francisco, Calif., on Thursday, Feb.19, 2015. (John Green/Bay Area News Group)
FILE - In this Wednesday, Jan. 22, 2014, file photo, Yahoo CEO Marissa Mayer smiles during a session at the World Economic Forum in Davos, Switzerland. Mayer posted on Tumblr, Monday, Aug. 31, 2015, that she's pregnant with twin girls, due in December. (AP Photo/Michel Euler, File)

By Mercury News | themerc@bayareanewsgroup.com

PUBLISHED: August 31, 2015 at 5:16 p.m. | UPDATED: August 12, 2016 at 1:31 a.m.

Yahoo CEO Marissa Mayer is pregnant with identical twin girls, she said Monday night.

Excited to announce that and I are expecting identical twin girls!!

— marissamayer (@marissamayer)

She and husband Zachary Bogue expect their daughters to arrive in December. Their first child, a son, was born in September 2012, shortly after Mayer took the helm of the Sunnyvale company.

“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,” Mayer announced in a Tumblr post Monday night. “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.”

Above: Yahoo CEO Marissa Mayer speaks about the company’s gemini advertising network at the company’s first mobile developer conference at Nob Hill Masonic Center in San Francisco in February. (John Green/Bay Area News Group)