Stephanie Pratt, one of the stars of "The Hills," was arrested on suspicion of driving under the influence early Sunday morning in Hollywood.

Police said Pratt, 23, was arrested at around 3:45 a.m. outside a nightclub in Los Angeles and taken into custody, with bail set at $5,000, according to Sergeant Mark Cohan of the Los Angeles Police Department. Before her arrest, Pratt was reportedly out with some fellow "Hills" stars at Empire, celebrating Holly Montag's 26th birthday.

Pratt was released with a ticket later Sunday morning and was not required to post bail but will return for a court hearing, according to a spokesperson at the Van Nuys Division, where Pratt was held.

Shortly before heading out to the club, Pratt tweeted, "It's my sissy @hollymontags bday party! Just finished dinner and going to Empire but I'm pretty tired aka yes i am the party pooper :("

Cohan said that he did not know the circumstances of the arrest and could not say whether Pratt was pulled over for another violation or if the stop was DUI-related.

Pratt was arrested in Hawaii in May of 2006, along with Hannah Owens-Bender, daughter of the director of ABC's "Lost," for second-degree theft and drug violations.

[article id="1614216"]Pratt has spoken[/article] in the past about her struggles with bulimia and self-esteem issues, as well as her battles with substance abuse.

A rep for Pratt had not responded to MTV News' request for comment at press time.