HUGH JACKMAN was the guest host of the WWE's "Monday Night Raw" this week . . . and like a good guest host, he actually got INVOLVED in the action. He was the corner man for ZACK RYDER in a match with a wrestler named DOLPH ZIGGLER.  And he ended up jumping on the ring apron and delivering a shot to Dolph's chops to help Zack win.  Well, according to Dolph, he's now nursing a FRACTURED JAW.  He Tweeted, quote, "Hairline mandibular fracture . . . it's not ballet . . . getting a special mouth guard tomorrow so I will NOT miss any WWE live events!!!"