Serena Williams and her husband, Alexis Ohanian, are getting into the holiday spirit with a little local theater -- showing face in a ballet play ... one that their daughter is in too.
TMZ has obtained photos of the couple onstage Sunday during a production of "The Nutcracker" -- which was being put on by a ballet school near Palm Beach Gardens, FL ... where this play was going down at a local venue, with the little ones taking the lead.