Brooks Nader Slaps Sister Sarah Jane Nader in New Poppi Ad

Brooks Nader Slaps Sister Sarah Jane Nader in New Poppi Ad

Brooks Nader does not mess around when it comes to her Poppi — and she’s willing to slap sister Sarah Jane Nader to get what she wants. In Us Weekly’s exclusive first look at a new social campaign for Poppi, Brooks, 28, and sisters Sarah Jane, 23, Mary Holland Nader and Grace Ann Nader all gathered around a couch to celebrate “Sismas” — a holiday Brooks hosts and described as “a time for all of us to get together, have our favorite food, have ou…