Jason Biggs and Jenny Mollen are expanding their family!
The hilarious couple took to Instagram on Wednesday to announce the happy news like only they can.
EXCLUSIVE: Chelsea Handler Tried to Guilt Jenny Mollen Into Shark Diving, So She Sent Husband Jason Biggs Alone Instead
"This is how I told my son babies are made. #numbertwo #nosefrida @fridababy #teetsreincarnated," Mollen captioned the snap of herself and Biggs posing with a Snotsucker.
The pair -- who are already parents to 3-year-old son Sid -- couldn't be more "thrilled."
"Jason is thrilled," Mollen tells ET. "Sid understands that there is something in my stomach but he is growing increasingly more and more frustrated that he cannot see its face."
"We don't know the gender yet. I'm hoping it's a poodle," she joked. "[The baby is] due beginning of October."
WATCH: An 'American' Red-Carpet Reunion
ET caught up with Biggs and Mollen in August, where they opened up about prioritizing their marriage while balancing their careers and parenthood.
"It is especially hard to have sex," Mollen answered candidly. "We have a nanny as well, living in the house, and I don't know why [but] for me, I'm just like, 'There's people here! We're not all alone!' There's just this anxiety."
"For instance, when we were on vacation [with friends], we were those people who were like, 'Should we have sex in our car?' We became those people," she added.
It seems the couple has gotten over their anxiety, however, as Biggs revealed he "would love a little girl."
See more in the video below.
Reporting by Deidre Behar.