Marissa Mayer's twin girls are here! The Yahoo! CEO, 40, and her husband Zachary Bogue welcomed identical twin daughters Thursday and wasted no time sharing the exciting news with world.

"Zack and I are excited to announce that our identical twin girls were born early this morning. Our whole family is doing great! @zackbogue," she wrote. "Thanks to everyone for all of the support and well wishes throughout my pregnancy," she added in a post to her Tumblr account. 

Mayer's big news received a number of congratulatory comments, including several from tech executives like Google CEO Sundar Pichai and Microsoft CEO Satya Nadella. Mayer and Bogue, who wed in 2009, are also parents to 3-year-old son Macallister, whom Mayer was pregnant with when she accepted the CEO position at Yahoo! in 2012.

Mayer announced in a September post on Tumblr that she and her husband were expecting twins.

"The twins part was quite a surprise because I have no family history of twins or any other predisposing factors," she wrote at the time. "However, as I've now learned, identical twins occur by random chance in roughly 1 out of approximately every 300 pregnancies. Zack and I have embraced the surprise and are very excited about these new additions to our family."

Similar to her first pregnancy, Mayer revealed that she would be "taking limited time away and working throughout." However, she did not downplay how hard it will take to juggle motherhood and her career.

"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.

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