Coco Rocha and her husband of four years, artist James Conran. (@StyleList / Twitter)

Rocha made the announcement by posting a 360-degree video to her Instagram in which she is wearing a nude bodysuit that shows off her barely visible baby bump.

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The caption to the video reads, "We are absolutely thrilled and elated to announce that after four years of marriage we are expanding our family and expecting our first child spring of 2015!"

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