Kris Humphries -- My Mom Is Moving In (To My Building)

File this under awwwkward ... Kris Humphries' recently-divorced mother is getting a brand new condo -- IN THE SAME FANCY BUILDING as her NBA player son!!!!!

Sources close to Kris tell TMZ ... following his parents' divorce, his mom moved out of her house in Minnesota -- and started crashing at Kris' pad in NJ.

But TMZ broke the story ... Kris recently moved to a swanky $8k/ month condo in NYC when the Nets moved to Brooklyn -- and now his mom is following suit.

We're told Kris is footing the bill on the rental (which is NOT on the same floor as his) -- but Mama Humphries DOES have a key to his apt ... and likes to show up unannounced sometimes.

Sources close to Kris tell TMZ ... his mom always wanted to move to the Big Apple and Kris couldn't tell her no -- but he also likes having her around.