'Dance Again' singer Jennifer Lopez is unsure if marriage is on the cards ever again for her even though she is in a long-term relationship with back-up dancer Casper Smart.

The 44-year-old says that despite all the challenges she faced in her previous relationships, she believes in love, reported Contactmusic. "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," she said. When asked if wedding bells are in her future, she replied, "I don't know, we'll see.

I don't know." Lopez thinks Casper Smart is "fantastic" with her children but the singer still isn't sure if a fourth marriage will ever happen. "I don't like the word father figure, but he's fantastic with the kids and he helps me very much with my work," she said.