Former Big Brother housemate Claire Rehfuss is addressing rumors claiming her ex Derek Xiao cheated on her. Rehfuss, 29, took to X on Sunday, February 1, to share a screenshot of a fan comment that read, "Claire BB23 liking two of my TikToks that exposed Derek BB23 of cheating on her with his coworker Olivia and dating a week after they broke up." The screenshot was originally shared by an X user who captioned it with, "Derek from BB23 cheated on Claire. Whitney's karma.