Actor Chad Lowe has blasted rumors his girlfriend Kim Painter has been conducting a secret affair with Val Kilmer.

The Unfaithful star's producer beau was recently photographed out and about with 48-year-old Kilmer - but Lowe, brother of actor Rob, has vehemently denied any romantic relationship between his partner and the Alexander star.

Lowe's spokesperson tells the New York Post's gossip column PageSix the actor and Painter are "madly in love", adding: "Val and Kim are old friends and were working in Los Angeles together."

(This news article provided by World Entertainment News Network)