'Girls' Allison Williams Gives Birth To Baby Boy!

She may have starred on one of the biggest television shows associated with millennial culture, but 'Girls' Allison Williams can now add another significant role to her resume: She's now a mother!

Williams, 34, recently gave birth to her first child. No, she didn't have a girl, either!

She and boyfriend Alexander Dreymon quietly became parents to a son, who they've named Arlo.

Arlo arrived on the scene at some point in the Winter, according to People.

Arlo's exact birthday isn't known, and the proud parents are striving to keep it that way.

In fact, Williams and Dreymon, 39, have decided to keep their entire relationship on the downlow and away from the public eye.

The two met and began dating after starring in the film "Horizon Line" together three years ago.

The quiet couple prefer happily coasting under the radar, making a strong effort to keep Arlo's arrival as private as possible.

"They're both private people individually, and they made the decision to keep this happy news to just a small circle of friends and family," a source told People.

Williams and Dreymon have fully embraced their newfound role as parents!

The source added, "They're over the moon" about Arlo's birth.

The pair aren't only over the moon with their baby boy but they're also over the moon with one another as well!

"They seemed to be very happy and very much in love," after being recently spotted on vacation together along with Williams' father Brian and other family members in the Bahamas, according to the aforementioned source.

Dreymon has an important factor in common with his lady- he is an actor, too!

You may know him from his roles in "The Last Kingdom" and "American Horror Story: Coven," via W Magazine.

He also hails from Germany!

Dreymon's role in "The Last Kingdom" is a major role in his career trajectory.

The Netflix series concluded after fifth seasons last month, featured Dreymon playing the role of Uhtred.

His longtime role was extremely important for Dreymon, and "The Last Kingdom" has built a cult following over the years.

"The Last Kingdom" has drawn comparisons to the monster HBO success story "Game Of Thrones" and Dreymon felt anything but slighted by the comparisons.

"I think it's a compliment being compared with 'Games Of Thrones'," he told The Carousel, "Just because it's an epic show."

As for what set "The Last Kingdom" apart from its similar counterpart, Dreymon said, "I think 'The Last Kingdom' is a bit grittier and dirtier, and then it's based in history- I think it's a very different show."

While she may be embracing her new role as a mother, the actress will soon return to the front of the camera.

Williams is slated to star in a film called "M3GAN" which will be released next year!

The role will bring Williams back to a genre she has had enormous success with in the past; "M3GAN" is based on a story written by James Wan, whom The Hollywood Reporter called a "master of horror."