Yahoo CEO Marissa Mayer is expecting twins.

Mayer shared the news early Tuesday with a post on her Tumblr. She says the twins, identical girls, will arrive in December.

Mayer says she plans to work throughout, as she did with her first pregnancy in 2012.

“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. 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. I want to thank them for all of their encouragement as well as their offers of help and continued support,” says Mayer.

Excited to announce that @zackbogue and I are expecting identical twin girls!! http://t.co/N25wQl4hmv

— marissamayer (@marissamayer) September 1, 2015

Mayer also shared some optimism for the future.

“Leading Yahoo in our renaissance, alongside a terrific and dedicated team, has given me tremendous professional pride in our accomplishments. I’ve never been more excited about our progress and the growth opportunities for our amazing company. At the same time, I’m blessed to have experienced some of my most extraordinary and proudest personal moments while being Yahoo’s CEO. Moving forward, there will be a lot to do for both my family and for Yahoo; both will require hard work and thoughtful prioritization. However, I’m extremely energized by and dedicated to both my family and Yahoo and will do all that is necessary and more to help both thrive. The future looks extremely bright on both fronts,” she writes.

Image via Yahoo, Wikimedia Commons