Article continues below advertisementKate Middleton is kicking off 2026 under renewed strain as tensions within the royal family sharpen, with insiders telling OK! "open warfare" has erupted between the Princess of Wales and Queen Camilla - which they say has become "almost impossible" to contain.The latest flare-up between the pair follows months of murmurs about a breakdown in their relations, which palace aides say dates back to a moment last year during the state visit of Donald Trump, 79, and his wife, Melania, 55, to Britain.