Jennifer Lopez wants to marry Casper Smart.

The 43-year-old singer-and-actress - who has been married three times before to former husbands Marc Anthony, Cris Judd and Ojani Noa - has only been dating the 26-year-old back-up dancer for a mere 18 months, but has told pals she's so in love that she doesn't need a prenuptial agreement before she ties the knot.

A source told OK! magazine: ''Jennifer insists that their love is real, just like she did with the first three husbands and to prove to herself she's refusing to have her lawyers draft a prenup.

''It sounds silly but it's her way of convincing herself, her exes and the world that Casper is not just a rebound like some critics claim. Making their love about love, not money, is Jennifer's only way to say to herself that Casper is a 'til death do us part' kind of guy.''

The 'Dance Again' hitmaker - who has five-year-old twins Max and Emme with her ex-husband Marc - wants a baby with her beau and has allegedly turned to IVF in the hopes of getting pregnant.

A source said previously: ''She's scared that time isn't on her side with regards to her age. But she's hoping that with fertility treatments she'll be pregnant in the next couple of months.''

The singer wants to keep her fertility treatments a secret and Casper has agreed they will both act surprised when they announce she is pregnant.

The insider added: ''She's paranoid about people knowing about her pregnancy hardships, because it makes her feel old.

''He loves Jennifer and he knows he's set financially for life if she has his baby. They made a deal that when the pregnancy happens, Jen will make it sound like an 'oops' and a blessing at the same time, even though she's actually planned the whole thing.''