The 16-year-old X Factor hopeful has been romantically linked with the eliminated singer in recent weeks, and has confirmed that they are "close".
"Sam and I are close, we are a unit. We understand each other," she told The Sun.
"He wasn't getting the best comments from the judges but he does things in a positive way.
"He is a really good support system."
Foster recently played down reports that she was dating Sam Callahan, saying that she is not ready to embark on a relationship at the moment.
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