Say it ain't so, Lauren Conrad!

The Hollywood Gossip reports that The Hills star was seen playing tonsil hockey with a random dude in Vegas this past weekend before the Video Music Awards. And just who was this mystery man?

Supposely … (gulp)… Cisco Adler.

That's right, the celebrity gossip source says LC and Adler were getting to first base Saturday night, according to several disgusted spies at the nightclub.

We feel sick just thinking about this.