Jennifer Lopez decided to hit the road after her split from singer Marc Anthony two years ago.

Then she went on her first world tour, visiting 65 cities on five continents and reaching 1 million fans.

If you didn't get to see the tour in person, you can catch it on HBO on New Year's Eve. "Jennifer Lopez: Dance Again," premiering on HBO and HBO Latino (9 p.m. Eastern), includes performances and behind-the-scenes footage from the tour.

"I had just gotten divorced, was a single mom for the first time (and) decided to go tour the world," Lopez said in a recent interview.

The 45-year-old singer-actress said she realized the show was more than an arrangement of musical numbers; it was a mirror of that time in her life.

"Looking at all my music and putting this show together and seeing, 'Who was I as a person? As an artist? What did I want to say with this show?' ... It was self-reflective," she said.

"Dance Again" includes rehearsal footage, interviews with family members and a few tense moments, such as when a dancer unexpectedly quits the show.

Fans will see how difficult it was for Lopez to leave "American Idol" after two successful seasons. (She has since returned to the Fox show, with the 14th season premiering Jan. 7.)

Cameras also show Lopez heartbroken that her twins, Maximilian and Emme, now 6 years old, were missing their father.

One touching part of the documentary shows Lopez ending her tour in Puerto Rico with Anthony, who recently remarried, joining her onstage for a surprise duet. 

Lopez said it was important for her children to see their parents together, working cooperatively.

"They don't do what you say, they do what you do. You've got to show them we're not together, but we're together for you. When it comes to you, you're so important to us and you're so loved," she said. 

"I reinforce that their dad loves them, and he reinforces that I love them," the singer said. "Kids with divorced parents – and I think about this all the time – they feel like one of their parents doesn't want to be with them or doesn't care about them. We reinforce that even not being together is for them. It's the best thing."

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