“They are both very happy," Megan's publicist Leslie Sloane Zelnick told the NY Post.
The 27-year-old beauty gave birth to her first baby, son Noah, on September 7 of last year.
She waxed poetic about her transition to motherhood to the March edition of Marie Claire UK: "All I wanted to do my whole, whole life was have a baby and, now, I've finally done it … I just want to give Noah as much of myself as I can.
"And I want to have more kids -- that is where my heart is."
The Jennifer's Body stunner has since reunited professionally with former Transformers director Michael Bay, and is currently collaborating with the filmmaker on a reboot of the Teenage Mutant Ninja Turtles series.
Brian, 40, has a son named Kassius, 11, with his ex, Las Vegas star Vanessa Marcil, 44.