Kim Kardashian spared no expense with the latest gift she gave to her four kiddos. The SKIMS mogul and Keeping Up With The Kardashians star, 41, built a ‘Lil Hidden Hills,’ for children North West, 7, Saint West, 5, Chicago West, 3, and Psalm West, 1, according to Daily Mail. In the photo below, fans could clearly see the Lego Castle that Kim had built for her youngsters, whom she shares with Kanye West, to enjoy on any given day as they grow up.