The supermodel was recently rumoured to have been spotted canoodling with actor Nikolaj Lie Kaas on a trip to Barcelona.
But Helena insists the claims are untrue.
Her agent says, "She has heard the talk and she's disappointed. She and Nikolaj are childhood friends and that's all there is to it. She's still very much with Norman."
Christensen and Reedus have a three-year-old son, MINGUS, together.