Colleen is a Moroi wedding planner, and is the one who organized Sonya and Mikhail's wedding. She greets Stanton, Ian, and Sydney, and leads them to their reserved seats for the wedding. She later yells at Abe Mazur when he doesn't sit in his designated seat.
Colleen appears to be nice, but efficent. Although, she is somewhat nervous about speaking to the three Alchemists, she is not as nervous about speaking to them as they are.