A prostitute and her teenage son were busted in the fatal stabbing of one of the woman’s Bronx johns last month, sources said.

Shamika Mosley, 34, and her 14-year-old son were arrested Thursday night in connection with the Dec. 11 murder of Calixto Palacios, 61, inside his Fordham Heights apartment, the sources said Friday.

The son could be seen on surveillance video entering the building and emerging later with blood on his sneakers.

When questioned, Mosley blamed the fatal stabbing on her son. Both mother and son were charged with murder and robbery, cops said.