Cocaine and booze were in abundance at Lindsay Lohan's party where Barron Hilton was beaten to a pulp ... multiple sources tell TMZ.
Our sources say a number of people at the party were snorting and drinking non-stop. Sources connected with Lindsay insist she was NOT partaking and even threw some of the druggies out of the party.
Now check this out ... the video showing Barron confronting Lindsay was shot around 11AM EST Friday ... the party having started the night before.
So check out the video. We gotta ask ...