Heather took to her Instagram page to pen a sweet message to her stepdaughter.
The star shares two stepkids, Taylor, 12, and Brayden, 7, with husband Tarek El Moussa from his first marriage.
She posted a picture of them in the car's back seat, receiving a peck from the 12-year-old.
Heather disclosed to fans that Taylor had requested to be the first to know if they decided to have a baby.
The real estate mogul also posted a slew of pictures showing how her husband reacted to news of her pregnancy.
Tarek was seen to have used a curse word to express his surprise at the news before kissing his wife.
She also shared how she got to take the pregnancy test in the first place.
The expectant father took to his Instagram to eulogize his wife, calling her the woman of his dreams.
He also shared how news of his first child reaffirmed some of his beliefs to keep his family first and love them unconditionally.