United Kingdom, Feb. 14 -- Jane Fonda warned Jennifer Lopez to tone down her public displays of affection with her husband Ben Affleck.

The veteran actress has been good friends with Jennifer since they starred together in 2005 film 'Monster-in-Law' and Jane agreed to take part in Jennifer's new film 'This Is Me ... Now' inspired by her revived romance with Ben - but Jane had some reservations about getting involved with a movie which celebrated the couple's real life relationship.

According to Variety, Jane told Jennifer's manager Benny Medina: "I believe that everyone in the entire world is pulling for this relationship and this love. And the idea of how you present that is so sacrosanct, so important.

"It should be handled in a way ...