Jennifer Lynn Lopez

In 2004, during low-key visits to the Children's Hospital Los Angeles, which Lopez is an avid support of, she befriended eleven-year-old cancer patient Paige Patterson. Patterson attended the inaugural Noche de Niños gala for the hospital in which Lopez was presented with an award, however the morning after became even more sick and died in November 2004. Lopez has stated that Patterson made her realize why her charity work is important. Lopez dedicated Rebirth, her fourth studio album, to Patterson. According to Lopez, Rebirth "came about because I was on such a roller-coaster ride, that was my career from my first album to my last album, and I did a bunch of movie projects in between. I finally took some time just for myself, and when I came back, this was the first project I did. I felt like it was a new beginning for me, like I was, in a way, reborn. I was where I was when I made my first album". Tracy Hopkins of NBC's Today Music noted that after "fawning" over Affleck on This Is Me... Then", Lopez "wisely keeps her love life out of the spotlight" on Rebirth and only references her relationship with Anthony on a few tracks.
In May, Lopez starred alongside Jane Fonda in the romantic comedy Monster-in-Law. She received $15 million for her role as Charlie, an artist who is pitted against her fiance's mother when she does not accept her as being the right woman for her son. With a production budget of $43 million, the film grossed a total of $155 million worldwide. The film received generally negative reviews from film critics, who stated although Fonda "steals the show" in her "return to the screen", the "tired" script and "flimsy performances" make Monster-in-Law fall "flat". In August, Lopez starred alongside Robert Redford and Morgan Freeman in An Unfinished Life, a drama film based on the novel of the same name. The film was a commercial failure, only grossing $18 million worldwide with its production budget of $30 million.
• 2006–09: Como Ama una Mujer and Brave
Bordertown, a film based on the Female homicides in Ciudad Juárez, made its premiere at the Cannes Film Festival on May 18, 2006. Lopez, who also acts as the film's producer, stars as Lauren Adrian, an American news reporter for the Chicago Sentinel who wants to be assigned to the Iraq front-lines to cover the war. The film received a limited release in theaters throughout Europe in 2007 and a direct-to-video release in many other countries in 2008, including the United States. Bordertown was a commercial failure, grossing a total of $8 million worldwide, with its $21 million production budget. DanceLife, a reality series following the lives of seven dancers trying to break into the world of professional dance, aired on MTV from January 15 to March 5, 2007. Lopez produced, created and was featured in the show. According to the album's co-producer Estéfano, Lopez's fifth studio album Como Ama una Mujer would "prove critics wrong" with its "big songs that require a voice"; referring to the criticism of Lopez having a "limited" vocal tone. The album received the highest first-week sales in the United States for a Spanish album and the highest digital sales.