It sounds like it's a sure thing.

Jennifer Lopez and A-Rod are so serious about each other that they're thinking about making it official, People reports.

"All the kids want Jennifer and Alex to get married. There are definitely talks about getting married, but Jennifer is old-school and will wait for the engagement ring before she entertains any wedding talk," a source dished to the mag.

"They are very happy that all the kids get along and have accepted their new family. Jennifer feels Alex is her true soulmate and can’t believe how happy she is with him," the source added.

We wish we could say we think they're going to live happily ever after, but we've been down this road more than a few times with Jenny from the Block!