Chrissy Teigen Rips Michael Costello, 'No Idea What the F***' He's Doing

Chrissy Teigen says she has "no idea what the f*** Michael Costello is doing" when it comes to faking an alleged DM convo between them ... and she's doubling down, insisting he's lying. Chrissy unloaded on the 'Project Runway' star Friday ...…