Blac, 28, is expecting her second child with Rob, but the baby will be the first for the reality star. But Blac insists she's not worried about how he will take to parenthood, because he has such a paternal side.
"He's a genuinely loving person..." she told the Daily Mail Online at a Cannes Lions event on Wednesday night. "Rob has all the qualities of a good father.... he'll be straight."
Rob's famous family have praised former stripper Blac for helping him get out of his reclusive state over the past couple of years in recent episodes of their reality show Keeping Up With the Kardashians.
However, Blac said it wasn't entirely her doing.
"It makes me feel good but I tell him to give himself some credit also," she explained of Rob's drastic turnaround in his life.
It has been claimed in recent weeks that Rob and Blac could be tying the knot as soon as next month. But those claims come as a shock to Blac, who said the pair hasn't "started any wedding preparation just yet."
The pretty blonde showcased her growing bump in a plunging metallic dress as she attended a yacht party at the media industry festival in Cannes, France.
Blac has not been afraid to experiment with maternity fashion during her pregnancy so far, but says her main concern about choosing what to wear for her changing figure is "keeping my a*s covered!"
But she added: "Pregnancy has treated me well so far."
Rob and Blac announced their engagement in April, 2016 after a whirlwind romance, and last month, the couple revealed it was expecting its first child together.
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It has also been confirmed that the parents-to-be are filming a Keeping Up With the Kardashians spin-off - a new six-episode docu-series which will air later this year.
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