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Add another Hollywood celeb to the DUI club! Not that Stephanie Pratt is REALLY a celeb, but still.

The Hills starlet - who's admitted to being addicted to drugs and alcohol in the past - was arrested for suspicion of DUI at 3:45 earlier this morning in Hollywood.

Apparently, the 23-year-old was partying last night at Empire for Holly Montag's birthday. Steph is currently being held in custody in Van Nuys jail and bail is set at $5,000.

Can you believe it??? I'm glad this didn't happen to Kristin or Audrina! Stay tuned to X17online for more deets!