The movie legend admits she has become hooked on TV talent show American Idol because she loves to see what looks judge Lopez adopts for the show.
Fonda tells Entertainment Weekly magazine, "I like looking at Jennifer Lopez."
And the actress admits her former co-star is well aware she has a crush on her: "In one scene (in Monster-in-Law) we were sitting across from each other at a table and I said, 'I just have to tell you something: It's like looking a perfect piece of Mayan sculpture.'
"She is really, seriously beautiful."
The couple, which has been married for 17 years and has a 15-year-old daughter, Mayan, announced it had parted ways earlier this year (10).
And now Ann lopez has lodged legal documents in Los Angeles Superior Court, citing "irreconcilable differences".
She is requesting spousal support, as well as primary custody of Mayan, reports TMZ.com.
The pair is not thought to have a pre-nuptial agreement in place.
The couple has been married for 17 years and has a 15-year-old daughter, called Mayan.
Sources tell TMZ.com the Lopezes split earlier this year (10).
The pair hit the headlines in 2005 when Ann Lopez saved her husband's life by giving him one of her kidneys.
She told reporters, "George, he comes from a very dysfunctional family, a horrific childhood. It was hard for him to accept that someone would give him the gift of life."
The Lopez Tonight host added, "I was crying. I thanked her and I told her I loved her. I was more concerned about her than I was about myself."