"A few years ago he danced for her - the first time was years ago. He's a lovely guy, so I'm happy that he makes her happy."
Kimberley added: "I think it could definitely go the distance, they're really happy."
While there could be wedding bells in Cheryl's future, it doesn't sound as though Kimberley's about to rush down the aisle.
Asked whether she would be marrying long-time BF Justin Scott, she replied: "It's been nine years. I think because we know we're going to be together it's just something we haven't got around to doing."
The singer also discussed rehearsing for the upcoming Girls Aloud tour.
"We do sometimes forget lines," she admitted. "Because we're doing a greatest hits tour, we're having to go over all of our old songs - we've had 20 top ten hits."
Kimberley added: "I'm getting ready for filling in lines for... ahem ... Nicola. She gets so carried away and then she's like 'oh did I miss my lines?'."
Check out the full interview on ITV tonight at 9.45pm.
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