Defeating the likes of Martin Kemp and MC Harvey, the Loose Women presenter was ultimately beaten to first place by Julian Clary.
Speaking to Brian Dowling afterwards, she said she had expected to go out first, and described it as "unbelievable" that she had come second and been the final woman on the show.
She added that she was "so humbled" by people voting for her.
The Nolan sister went on to say that the experience had been "so different" from what she had expected as a former viewer, explaining that there was a lot of "tension" and paranoia" in the house.
Asked about her "turbulent" relationship with Julie Goodyear, she said that she had initially assumed the two would get on, but that she felt "something there" from the second day.
Coleen could not explain the problems between them, saying: "I want to know too."
She added that there was a "fakeness" about Julie, describing how the Corrie legend would be nice to her face but then say nasty things behind her back.
She did admit, however, that Julie had been a "great housemate".
Calling her experience "amazing", the runner-up finished by saying Julian was a "deserved" winner.