She took to Instagram to make the announcement, addressing her challenges with infertility in the past.
"It hasn't been easy, but we kept trying because we can't wait to bring our first child into the world and grow our family," she said in the post.
In a past episode of FABLife, Teigen and co-host Tyra Banks discussed their infertility struggles.
Watch FABLife weekdays at 2 p.m. ET | 3 p.m. PT on ABC.
The Walt Disney Company is the parent company of ABC and this station.