The British actress-turned-fashion designer admits it was incredibly tough getting over Jude - with whom she has three children, Rafferty, 13, Iris, nine, and Rudy, eight - after their divorce in 2003, following six years of marriage.
Despite the emotional pain she suffered, Sadie insists she now gets on well with the actor and his fiancee Sienna Miller.
She said: "We still have a very good relationship considering everything we`ve been through. I`m glad that he is happy and I know he only wishes me well."
The 45-year-old star accepts she has to get on with Sienna, 28, because she has "some kind of relationship" with her children.
She added to Closer magazine: "Me and Sienna have to have a relationship because I am a mother and she`s got some kind of relationship with my children, but we have pretty much made it work. I like Sienna a lot, she`s a great girl."
Although Sadie now gets on Sienna, she was unhappy when the `Stardust` actress took Iris to the hairdressers and had her hair cut into a pixie-style without Sadie`s consent.
At the time, Sadie wrote on twitter: "I think ya should get ya own child and then cut their hair! (sic)"