Lauren Srisai is Teddy's older sister, and the wife of Stu. She was born in Thailand and where they placed their pre-wedding brunch as she is trying to get her father's blessing for Stu and her. Stu was worried what she would say about the tattoo on his face but she said she liked it. Lauren returned in the third film, but had a small role.
Her actress is actually Korean in real-life and not Thai like Lauren.