Katie Grober. Actress: Love Life. Katie is an actress / musician who is best know for her role as "LULU" in the Broadway show WAITRESS (2017-2018). She made her featured film debut in Jason Mraz's documentary film "Have It All The Movie" (2018) and on NBC's TODAY Show playing her ukulele and singing along side the Grammy artist Jason Mraz, and is also featured in his "Have It All" music...