Rosamund Pike has banned alcohol on the morning of the Oscars.

The 'Gone Girl' star is nominated for Best Actress at the Academy Awards - which take place tomorrow (22.02.15) night - for her portrayal of Amy Dunne in the psychological thriller but insists she won't be celebrating with a drink if she wins until ''long after'' the ceremony.

When asked if she'll be enjoying a champagne breakfast on Oscars morning, she told E! News: ''I doubt it, no. No drinks until long after the ceremony's over!''

However, the 36-year-old actress - who has two-year-old Solo and two-month-old Atom with her partner Robie Uniacke - does have one worry ahead of the ceremony, a wardrobe malfunction because of her need to breastfeed her young son.

Speaking about her commitment to her little one previously, she said: ''You go from the super glamour of the red carpet to sitting in a robe in a corner of the backstage area, and then back out into the limelight.

''The potential for wardrobe malfunctions is never far from my mind. But all that is added drama. It's fun.''

Rosamund is up against 'The Theory of Everything's Felicity Jones, 'Wild' star Reese Witherspoon, 'Two Days, One Night's Marion Cotillard and 'Still Alice' star Julianne Moore for the Best Actress gong at the ceremony, which takes place in Hollywood, Los Angeles.