TMZ.com: Cardi B's Ex Offset Wanted DNA Test For Her Baby with Stefon Diggs - OFFSET TO CARDI B I WANT DNA TESTING ON YOUR BABY W/ STEFON!!! ... Cardi B's got some 'splaining to do about the paternity of her youngest child, at least according to Offset, who was clearly wondering if it was his or Stefon Diggs' ... TMZ has learned.