"Our very own 'GMA Day' co-host @sarahines is pregnant with baby No. 3!" the post reads.
Haines and Shifrin are already parents to 2-year-old son Alec Richard and 1-year-old daughter Sandra Grace.
Haines shared photos with Shifrin, their kids and her extended family on Christmas Day in December.
"Merry merry Christmas from the Haines/Shifrin!! Seeing our little family with my #Haines family (the originals + my niece & nephews) has my cup running over @maxshifrin @george5ge @abby_george_," she wrote.
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Haines had posted a cute picture in September during her family's visit to the "GMA Day" set.
"We just can't seem to get a family show when even half of us are looking at the camera - ha! @maxshifrin #Alec #Sandra," she captioned the snapshot.
Haines joined "GMA Day" as a co-host in September.
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