Rachel Bilson had one incredible summer by the looks of her latest photos on social media. The 43-year-old spent some time in the UK and posted a carousel of snapshots highlighting her excursions, including a trip to famed Notting Hill. However, it was a photo of her in a bikini that really caught her fans' attention – and it's not hard to see why, as she looked phenomenal. Rachel rocked a tiny two-piece that showcased her slim physique in all its glory.

The O.C. star wore a striped, halterneck bikini as she posed for a selfie, adjusting the angle so the camera exposed her figure from the neck down, drawing attention to her tiny waist and toned stomach. Rachel appeared to be makeup-free, and her complexion looked glowing with a smattering of freckles across her nose and cheeks. She wore

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