The "Blurred Lines" singer already has seven-year-old son Julian with estranged wife, Paula Patton.
April, 22, shared the happy news on Instagram, and revealed that their unborn baby is due to be born on what would have been the birthday of 40-year-old Robin's late father, Alan Thicke.
She shared a picture of her ultrasound scan and wrote, "Robin and I are very excited to share with you all that we're having a baby! The due date is March 1st, Alan's birthday! (sic)."
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