Hugh Hefner is reportedly planning to marry Playboy bunny Holly Madison before the end of the year.

Madison appears as one of Hefner's girlfriends on the Playboy founder's reality TV show The Girls Next Door.

A source told The New York Post: "Hef has decided he will marry Holly, and he wants it for his show The Girls Next Door. Hef thinks business all the time, and looks for a new hook, although he also does really love Holly."

Hefner is reportedly keen to keep his wedding plans secret because he is worried that monogamy will ruin the concept of the TV show.