Former THE O.C. star Rachel Bilson is struggling to come to terms with living the single life after breaking up with ex-boyfriend Adam Brody last year (06) - and is complaining of loneliness. The 25-year-old, who ended her three-year relationship with her O.C. co-star in December (06), claims she particularly feels the sting of their split at night. She says, "The nights can get lonely, y'know. I'm happy being single, but sometimes you need someone to cuddle."