Dana Tran — the mother of one of Sean “Diddy” Combs‘ children — is casually dating Desmond Scott … TMZ has learned.

Sources familiar with the situation tell TMZ … Dana and Desmond have been spending time together since Desmond’s estranged wife, Kristy Scott, filed for divorce.

We’re told things between Dana and Desmond are not particularly serious … at least not yet.

In fact, our sources say Dana and Desmond have only been seeing each other recently … and that’s kinda significant.

We broke the story … Kristy filed to divorce Desmond back in January … and she cited infidelity as the reason for the split.

A couple days after the divorce filing, we saw Desmond making out with model Marissa Springer in a Houston club.

Now, he’s dating Dana … and our sources are adamant there was no overlap between Desmond and Dana’s relationship and his marriage.