Mena Suvari previously told PEOPLE it was a "very emotional experience" finding out she was pregnant last year.
The pair share four other children: Mary Lucille Diana, 4, George Abraham Walker, 7, Junia Rosa Ruth, 10, and John Ira Shepherd, 12
Armie Hammer files for joint custody & requests estranged wife Elizabeth Chambers return to the U.S.
Elizabeth Chambers previously filed for divorce in July, seeking primary physical custody and joint legal custody of their two children
"We couldn't be happier," Cooper Hefner says.
Gigi Hadid and Zayn Malik confirmed that their relationship was back on in February.