'Superman' David Corenswet Defends 'Supergirl' Milly Alcock From Touchy Photog

Looks like Superman's cape comes with a personal-space policy ... 'cause David Corenswet stepped in fast when a photographer got a little too close to "Supergirl" star Milly Alcock. Check out the clip -- the Man of Steel went full Balls of Steel,…