McEntire's \"Reba\" co-star and longtime friend Melissa Peterman took to the comments to send Blackstock some birthday wishes of her own.

\"Happy Birthday Shelby!! You always make me laugh. You were a great kid who became a great man. I hope you have a fantastic birthday!\" she wrote to him. \"Oh and whatever your mom got you is from both of us.\"

McEntire shares her son with ex-husband Narvel Blackstock.

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