"Family Guy" creator Seth MacFarlane's house was ruthlessly T.P.'d last night by a ragtag group of Charlie Sheen supporters -- and TMZ has obtained photos of the butt paper attack.

Sources tell TMZ, two unidentified boys and one girl snuck onto Seth's Beverly Hills property around 11pm and unleashed T.P. fury -- finishing with the coup de grace ... a sign on Seth's front door, reading, "WINNING! Tiger blood!"


It's unclear what provoked the vandalism -- but the poster also taunts ... "Roast this bitch," referencing Seth's recent Comedy Central roast of Charlie.

So far, no police report has been filed.



3:50 PM PST -- MacFarlane just tweeted about the incident ... saying, "Actually I got in a brawl with a mummy. I won."

Seth MacFarlane just burned Miley Cyrus over our video of her smoking a bong -- by tweeting that if she would've been dressed up like Hannah Montana ... "no one would've known it was her."



His jokes really pack a punch.

Seth MacFarlane is one Flux Capacitor away from being able to travel back in time -- because TMZ has learned he's the proud new owner of an exact replica of the DeLorean from "Back to the Future."



Seth's people confirm the "Family Guy" mastermind purchased the DeLorean earlier this month. A source tells us Seth is having about $20,000 worth of customized equipment installed ... making it the coolest thing on wheels since the motorized bar stool.

One source -- who was lucky enough to sneak a peak at MacFarlane's unfinished DeLorean -- said the car already looks "insane."

Note to self: Don't bet against MacFarlane on any sporting events from now on.