Isla Fisher is “leaning on” Nicole Kidman amid her divorce from Sacha Baron Cohen. The ‘Borat’ star, 52, and ‘Wedding Crashers’ actress, 48 – who have children Olive, 17, and Elula, 13, and Montgomery, nine, together – confirmed earlier this month that they had filed for divorce last year after more than two decades together, and her close pal Nicole, 56, has been offering her support, having gone through a painful divorce from Tom Cruise, 61, in 2001, after 12 years of marriage, due to “irreconcilable differences”. A source told heat magazine: “Isla is desperate for things to be as amicable a…