Yung Berg — the guy who rapped on the song “Sexy Can I” — was violently beaten and robbed at a house in Los Angeles this weekend … TMZ has learned.

According to law enforcement sources, Berg — real name Christian Ward — was at a house party at around 2:00 AM Monday morning when four suspects entered the home and brandished firearms.

We’re told the suspects pistol-whipped two people inside the party — one of whom was Berg. Law enforcement sources say the suspects robbed eight people and made off with $10,000 in cash and jewelry.

A rep for Yung Berg said his client “has been in Vegas.” When asked if Yung was in L.A. over the weekend — the rep said he doesn’t know anything about the incident.

UPDATE

 Yung Berg has released a video where he further denies that he was beaten, robbed or pistol whipped in Los Angeles.