Chrissy Teigen's mom is proud to be an American! Access reports Vilailuck "Pepper" Teigen officially became a United States citizen on Tuesday, and she celebrated the big accomplishment with her granddaughter, Luna Simone, by her side.br Chrissy congratulated her mom on Twitter, sharing a video of the Thailand native cradling Luna in her arms as she recited the national anthem at her naturalization ceremony.