Jennifer Lopez may owe Jane Fonda a monster of an apology.

However, when the 2005 romantic comedyMonster-in-Lawcame up, so did an 18-year-old grudge.

As the title of the movie implies,Jennifer Lopezplays a woman with a future mother-in-law from hell.

MONSTERINLAW Jane Fonda Jennifer Lopez 2005. ©New LineCourtesy Everett Collection

©New Line Cinema/Courtesy Everett Collection

Now Fonda says those slaps were even harsher than they looked.

The thing that comes to mind right away is we have a slapping scene.

I slap her, she slaps me, Fonda toldBarrymore.

“Well, Jenniferas per Jennifershe had this enormous diamond ring.

After a bit of a pause, Fonda added, Shes never apologized.

We talked about how we were going to do this over and over again.

I was so afraid of her and she was so brazen and like, Just hit me!

Dont worry about it, its gonna be fine!

Lopez remembered the scene taking on a life of its own.

I just remember afterward Jane had a blood blister right at the top of her eye.

My nail, like, went up into her eye, Lopez said.

I was, Oh, Im so sorry, and she was like, Its fine, its fine!

Lopez added, She didnt care.

Shes such a gangster bitch.

I just love her.