The former Hills cast member was shown on last night's Channel 5 highlights show (January 15) telling husband Spencer Pratt and their fellow housemate Tricia Penrose that she found the glamour model's behaviour to be "super inappropriate".
[Heidi Montag in the Celebrity Big Brother house with husband Spencer Pratt]
Montag had hurried out of the bathroom when Banghard got into the shower, and told Penrose and Pratt: "I don't wanna be around it [her nudity], not around me and my husband."
When Banghard later returned to the bedroom after her shower, Montag told her to get dressed and not to get changed in the bedroom in future.
Former Heartbeat actress Penrose explained to Banghard that Pratt had been horrified to see her in the nude, but promised to stand up for her if the reality TV personality said anything about it to her face.
Earlier, Rylan Clark had told Big Brother in the Diary Room that he was "fascinated" by Pratt and Montag, but didn't understand their reactions to relatively small things such as him spraying his deodorant in the house.
[Lacey Banghard seen in the nude after forgetting to take her towel into the bathroom]
Banghard had been seen running through the house in the nude earlier in the week, after forgetting to take her towel into the bathroom when she took a shower.
She is up for eviction tonight along with Pratt and Montag - who are playing as one contestant - former X Factor contestant Clark and Steps singer Claire Richards.
Photo gallery - Celebrity Big Brother - Day 13 in the house: