It's the invisible woman! Black Swan star Natalie Portman wraps up from head to toe

http://www.youtube.com/watch?v=7ZbEXMqkFa4endofvid[starttext]By DAILY MAIL REPORTER Baby it's cold outside! Natalie Portman and her fiancé Benjamin Millepied head out for lunch in New YorkNatalie Portman is one of the most recognised faces in Hollywood after winning a Golden Globe earlier this year.But the Oscar nominee, who is expecting her first child later this year, was barely recognisable