Stephanie Pratt, 23, has been formally charged with drink-driving after her early-morning arrest two Sundays ago in Hollywood.

Pratt, a star on The Hills, was pulled over at 3.45 am after leaving Holly Montag’s birthday bash, which ironically was not attended by her high-profile sister-in-law.

Pratt faces up to six months in jail and a $1000 fine if she is convicted. She registered an .08 and .09 reading in two breathalyser tests. The legal limit in California is .08. She was taken into custody on $5000 bail.

The star later said on her Twitter page: “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 added: “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!”