The couple, together since 2004 and married since 2010, have three children (Noah, 4, Bodhi, 3, and Journey, 1); Green also has a son, 15-year-old Kassius, from a previous relationship.
But Green doesn't know if he's ready for another boy just yet, and noted he and Fox aren't necessarily trying for another child at the moment.
The 44-year-old actor discussed his desire for a daughter with Fox in a Facebook Live interview with Hollywood Pipeline on Monday.
He added, "I'm anxious that if I try, I'll just get another boy". 'Not just because I love my boys, but I'll have another boy and I don't know if I'm ready for five'. "So that would be kind of awesome".
VIDEO: Megan Fox is Pregnant!
Western Digital announces a massive 20TB external desktop storage system
Western Digital has launched a new version of its My Book Duo storage system offering a massive 20 terabytes of storage capacity. According to Western Digital, when operating in RAID-0, the My Book Duo 20TB is capable of hitting 360 MB/s sequential reads.
"Brian wants a girl, of course, because she wants to be a daddy to a little girl", Fox told The Daily Telegraph in June 2016.
He added: "I mean we fight, we disagree on things. So we stick it out", he said.
"Thank you for donating your DNA to the shared dream of birthing our own colony of teen heart throbs", the 31-year-old actress captioned a throwback photo of her husband as a young man. "#mcm #colonymission".
Most recently he was seen in a recurring role opposite Charlie Sheen on the sitcom Anger management from 2012 to 2014.
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