The 41-year-old actress - who split from long-term partner Johnny Depp after 14 years together in 2012 - recently chopped her long locks and says her dramatic new look has given her a new "energy".
She said: "You do feel different... You do, you do, you do.
"It changes... it does give you an energy, more younger than older."
The French actress - whose rumoured new boyfriend John Nollet is believed to have cut her hair - has been working on her first English language film, 'Fading Gigolo', alongside Sharon Stone, Sofia Vergara and Woody Allen, and despite the latter being subjected to allegations of abuse from his adopted daughter Dylan Farrow, Vanessa had nothing but praise for him.
Speaking to Porter magazine, she said: "Woody is brilliant, there's no other way to say it."
However, Vanessa - who has children Lily-Rose, 15, and Jack, 12, with Johnny - admitted he often put her off her concentration.
She added: "My character is very serious, so while Woody was being funny on set, I kept taking lice off children and saying my lines.
"But I didn't know when to say my line because he kept improvising - and I'm trying to keep a straight face, and be good, and act in English for the first time."