AceShowbiz -

It's official, Stephanie Pratt has on Wednesday, October 28 been formally charged with driving under the influence (DUI). "The Hills" star is thus facing six months in jail and a $1,000 fine if she is convicted of the related charge.

Stephanie Pratt was arrested on suspicion of DUI on early Sunday morning, October 18 in Hollywood following a party for her sister-in-law Holly Montag's 26th birthday at Los Angeles hot spot Empire. The Spencer Pratt's sister was pulled over by police and transferred to the Van Nuys jail for booking. She was later on released on $5,000 bail.

Few days after her arrest, Stephanie wrote via Twitter, "thanks for the kind messages & support! im doing fine!!! love u all! i was pulled over 4 tinted windows 3 blocks from where i was sleeping and blew a .08 which was 2 drinks. i made the wrong choice to drive and i take full responsibility."

She then continued, "i would never put other peoples lives at risk and want to be very clear that i was not pulled over for unsafe driving. 2 drinks ... call a taxi! pls learn from my mistake. love u alllll!" She, however, has not yet addressed her formal DUI sentencing.