Chelsea Houska announced the sex of her fourth child just days after sharing her pregnancy news.“Baby…….GIRL!!!!!!” the Teen Mom 2 star, 28, captioned an Instagram photo of her and her family popping pink confetti into the air on Friday, August 7.Houska and husband Cole DeBoer, who tied the knot in 2016, are already parents of Watson, 3, and Layne, 23 months.