Spa Spy: La Prairie Spa, Hotel Bel-Air, LA Opulent and glamorous, this five-star retreat has been a favourite of Hollywood A-listers for decades, with Grace Kelly and Marilyn Monroe among its guests. Set in a peaceful neighbourhood of wealthy Bel Air, it boasts 12 acres of breathtaking gardens, lavish rooms, unparalleled service and decadent cuisine. One of only four in the US, the impressive La Prairie spa was built during renovations in 2011 and is an idyll of tranquillity. A signature caviar massage ($215 for 60 minutes), using exclusive products from the La Prairie range to nourish and energise her skin. The procedure Spy hauled her body on to a heated bed, where her therapist, Annie, wrapped her in soft, warm towels. Relaxing sounds of the sea played as oils and creams were rubbed into Spy's skin, starting at her shoulders and working gently down to her toes. Anti-ageing caviar firmed and replenished, while an exfoliating scrub helped rejuvenate dead skin cells and aloe vera-rich moisturisers soothed her sunburn. The verdict Miraculous. The Swedish-style massage loosened her tight muscles, while the combination of treatment creams left her skin hydrated and glowing. Her sunburn, which had been painful to the touch, was eased - meaning she could wear her new strapless dress to dinner that night. The experience left Spy feeling so relaxed she nearly didn't make it to the restaurant, having fallen into a post-pampering slumber on her huge, springy bed. Medical opinion Dr James LeFanu says: "UV light, by the process of peroxidation, damages the fluid-conserving lipids that constitute the waterproof barrier on the surface of the skin. Hence the value of moisturisers in promoting recovery from sunburn - the simpler the better, such as aloe vera or urea-containing agents. Feelgood factor Part of the Dorchester Collection of luxury hotels, the Bel-Air treats guests like royalty. Spy's room contained all manner of hi-tech gadgets: her own iPad, a TV in the bathroom and the best waterfall shower she's experienced. Whether you're reclining by the pool, sipping cocktails at the bar or lingering over haute cuisine by chef Wolfgang Puck, a stay will transport you to another world. Just minutes by car from Venice Beach, Beverly Hills and the Hollywood strip, it's the perfect spot for exploring LA - and retreating to a serene hideaway at the end of the day. Details Rooms cost from £350 per night (suites from £580). Spa treatments from £33. For more information, call +1 310 472 1211 or visit hotelbelair.com. British Airways offer daily flights to Los Angeles from London Heathrow from £547 return. Air New Zealand offer daily flights from £523 return.