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Kelly Clarkson 's ex-husband Brandon Blackstock has died ... but his daughter is bringing a new bundle of joy into this world.

Savannah Blackstock Lee jumped on Instagram in July and announced she's preggers with her second kid by way of her husband, Quentin Lee ... and as you know, Brandon passed away Thursday -- weeks after her post -- following a long battle with melanoma, a serious form of skin cancer. Getty

Savannah -- the daughter of Brandon's other ex-wife, Melissa Ashworth -- wrote she and Quentin had been "keeping a couple of sweet surprises."

She highlighted their second daughter is expected in January, while describing their first daughter, Julianna , as "one of the greatest blessings to our family."

Savannah also got religious, talking about her f

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