Stephanie Pratt was arrested at 3:45 AM Sunday in Hollywood on suspicion of DUI, RadarOnline.com has confirmed.
"Stephanie Pratt has been booked on suspicion of driving while under the influence," LAPD Officer Kenneth Giles told RadarOnline.com
"Pratt remains in custody and very soon will be en route to the LAPD's Van Nuys Division, where all female suspects are taken.
"At Van Nuys, she could post her $5,000 bail and be released, or she could remain in custody until she sobers up. That will depend on her situation there."
The Hills star is the sister of Spencer Pratt and sister-in-law of Heidi Montag.