By Daniel Hunter

Yahoo chief executive Marissa Mayer has announced that she is expecting twins in December.

In a blog post, Ms Mayer said she plans to take "limited" time off, taking the pregnancy as she did with her son.

She received much media attention when she returned to work just two weeks after her son was born.

Ms Mayer said: "Moving forward, there will be a lot to do for both my family and for Yahoo; both will require hard work and thoughtful prioritisation.

"However, I'm extremely energised by and dedicated to both my family and Yahoo and will do all that is necessary and more to help both thrive."