ButtahBenzo is the close friendship of Shay Mitchell and Ashley Benson. They are best friends in real life. Ashley refers to Shay as her "boo" and also calls her by her full name, Shannon'
In a Seventeen magazine interview, Ashley Benson told them that Shay Mitchell is her best friend and she helps her with her love life. Ashley and Shay also post many photos on Twitter and Instagram of them together.
They have always had a close relationship. They are frequently seen together outside of the show. In a interview Shay referred to Ashley as "the little sister that I never had".