The 35-year-old beauty - who's been involved in an ongoing spat with her ex-boyfriend David McIntosh - has been told by show bosses that she's banned from dating her hunky American co-star because it could make things awkward on set.
She shared: ''I can't date him. We've been told we're not allowed to because, well ... we're just not allowed. It would just be awkward for everyone, we'd have a spat.''
But according to Kelly, the ban has helped make their sex scenes look even more realistic.
The British star told the 'Ellen Degeneres Show': ''We keep it all on screen. So when we're kissing, we really go for it because there's a lot of pent-up sexual tension.
''But they'll tell us, 'This is network television, don't do this'.''
Kelly confessed that while she would like to date a guy like Nick, 37, it makes sense that they resist the temptation.
She added: ''In my dreams I'd like to imagine he would date me. He's a lovely guy. But I do think it'd be easier not to.''
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