Bruce Willis reportedly had sparks flying with Lindsay Lohan, the heroine for his next film "Just My Luck", during the launch party for his latest release "Hostage", the New York Post reports.

Eyewitnesses reportedly saw Willis, 49, having "a grope-fest" with the 18-year-old "Freaky Friday" star Lohan, after which the two eventually went up to his hotel suite to celebrate with pals.

Lohan's rep has, however, denied the rumours saying: "She is not interested in Bruce Willis in any way but as the producer of her next film ('Just My Luck')."

The rep said that Lohan - who is just two years elder to Willis' eldest daughter - was meeting him for the first time at the party after the filming of the action movie "Hostage".