Audrina Patridge believes she knows who leaked nude modelling photos of her, and reveals she feels hurt by the betrayal.

The Hills actress was 18 when she posed for the series of risqué shots after graduating from high school thinking it would help launch her career.

She says: "They were intended for my personal use and portfolio only. I never imagined they would come out."

However, the daring snaps made their way onto the internet last week, and Audrina’s not too happy with the person who made them public.

She tells In Touch magazine: "I know who it was because she's the only one who ever had the photos. I was betrayed. I never thought she would do that."

Click here to see raunchy pictures of Audrina.