Robin Wright Penn at New York Premiere of 'Hounddog' at the Village East Cinemas - Arrivals. New York City, USA - 16.09.08

The star - married to Sean Penn - has always wanted bigger breasts, but is too scared to go through the surgery to have them enlarged for real.

So she jumped at the chance to have them expanded onscreen.

Wright Penn says, "They go, 'What do you want to look like?' They can make you bigger, smaller.

"I said, 'can you make me a 36D, because I've always wanted bigger boobs. And he did - without all the pain and surgery."

Source: WENN