"The child will be biologically Sofia and Nick's baby, and she has selected a surrogate -- who is a very close girlfriend -- to carry the baby," an insider told the newspaper.
"A procedure has taken place, and Sofia and Nick will find out in a few weeks if it was successful, if the surrogate is pregnant, and if they will become parents," the source said. "A baby is something they've both wanted for a while, particularly Nick, who has been pushing for it. He is a little uneasy that the surrogate is Sofia's close friend, but is very excited about becoming a father."
Vergara, 40, is one of the stars of the TV sitcom "Modern Family." She has a 21-year-old son, Manolo, from a previous relationship.
The actress has been dating businessman Loeb for about three years.