Justin Bieber — Pics Trigger Underage Drinking Investigation

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Justin Bieber”s Dos Equis fiesta inside a Texas nightclub this weekend has created a brew-haha with State officials … our sources has learned.

We broke the story … Biebs was getting loose at Nox Houston Friday night.  Someone from bar management told our sources Bieber was drinking water, and that”s it.  But a rep for the Texas Alcoholic Beverage Commission says a complaint has now been filed … and an investigation has been launched.

If  ABC officials conclude Bieber was drinking — the bar”s license could be on the line.  Bieber, on the other hand, is in the clear because he wasn”t caught in the act.