Jennifer Lopez and Casper Smart [Photo/Agencies]

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Season 12 finale of 'American Idol'

The 'American Idol' beauty admitted she isn't sure if she will walk down the aisle for a fourth time with the backing dancer, who she has been dating since splitting from husband Marc Anthony in 2011.

When asked about marriage at a press conference on Monday, she said: "I don't know. We'll see. I don't know.

"You know, I've always believed in that institution. I believe in it, but it is difficult. I've had my challenges, but at the same time I believe in love, and I think that is the main thing."

Jennifer - who took a year away from the 'American Idol' panel last year - also said 2013 was a pivotal time for her, where she learned a great deal about herself.

She added: "That was such a transformative year for me in so many ways. I had just divorced, I went on tour with the kids [five-year-old twins Max and Emme], and I left 'Idol'. All my security blankets were gone, and I was out there doing something I had never done before.

"[But] I was surrounded by love and family. I really grew. My goal was not to come out the other side and just survive it but grow as a human being as well as an artist, and I felt I did. I learned a lot."

Reports have suggested Jennifer, 44, and Casper, 26, have been drifting apart recently after a number of heated arguments.