She is famed for her pride in her curvy figure — and actress Kate Winslet (search) says reports that she had slimmed down to a British size 8 — the equivalent of a U.S. size 4 — are "insane."

British newspapers carried prominent photographs Monday of the svelte-looking "Titanic" (search) star in a floor-length Ben de Lisi (search) gown at the premiere in London Sunday of her latest movie, "Finding Neverland."

Most speculated that she had been dieting to regain her figure after the birth of her second child, Joe.

"It is so insane; I haven't lost any weight," Winslet said in an interview Monday morning with GMTV.

"Everybody likes to think it is a great story to talk about my fluctuating weight. The reality is I have had two children in four years and the only time my weight goes up and down is when I'm pregnant, which happens. I have stayed the same weight apart from those times," she said.

In "Finding Neverland," the 29-year-old Winslet plays Sylvia Llewelyn Davies, whose four young sons inspired Scottish author J.M Barrie — played by Johnny Depp — to write the children's classic "Peter Pan."

The film, which also stars Julie Christie and Dustin Hoffman, tells how Barrie, who had no children of his own, befriended the Davies boys in London's Kensington Gardens.

Winslet is married to Sam Mendes, director of the Oscar-winning "American Beauty" and creative producer of the upcoming stage version of "Shrek."