Stephanie Pratt Going Into Rehab

Stephanie Pratt is going into a 30-day in-patient alcohol rehab program, The Hills star confirmed Friday. The reality star was in a Los Angeles court where she pleaded not guilty to a misdemeanor count of DUI.

Spencer Pratt's little sis was busted after attending a birthday party for Holly Montag last month. Holly is her Hills costar and her sister-in-law Heidi Montag's older sibling.

Just days ago Stephanie told RadarOnline.com her arrest was a "set up" -- she said she'd only had "two drinks" -- but it was also a "blessing."