They recently set off on a luxurious glamping trip to a national park in Utah, travelling in style with an extravagant recreational vehicle (RV) that is believed to cost over $1million.But on Saturday, Justin Bieber and his wife Hailey Bieber were seen getting back to nature, as they stripped down to their swimwear to cool off in a lake, while also enjoying some serious public displays of affection.Hailey, 23, showed off her impressively toned physique in a green bikini, while Justin, 26, displayed his tattoos wearing a pair of tropical-print swim shorts.