For most girls, the last people they'd turn to for dating advice would have to be their parents, but for Rachel Bilson, her mum's one of the only people she'd ask.

The 25-year-old told US magazine Your Look that her mum is great to chat to about guys and even worked out for herself when she first got serious with one.

"My mum's a sex therapist, so she's great at talking about relationships," the OC actress revealed.

Apparently, her mum had plenty of advice for her the first time she got intimate with a guy - an discussion which Rachel described as "weird, but helpful".

She's also the only person that Rachel is prepared to talk to about her break-up with ex-boyfriend Adam Brody.

"I don't talk about my break-up with Adam," she insisted, adding that when the whole world knows everything about you it feels "invasive".

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? Adfero Ltd