The 23-year-old Pratt is best known for her work on TV's "The Hills."
Pratt was arrested early Sunday in Hollywood, taken to the Van Nuys jail and released later in the day after posting $5,000 bail, a Los Angeles police spokesman told E! News.
She reportedly had been out at dance clubs and bars celebrating her co-star and sister-in-law Holly Montag's 26th birthday.
Pratt's brother, Spencer, is married to Holly's sister, Heidi.
Copyright 2009 by United Press International.
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