The 29-year-old star, who picked up the Best Actress Oscar at the ceremony last month, is currently expecting her first child with fiance Benjamin Millepied.
Asked about her cravings, she said to UK's new! magazine: 'I'm embarrassed at what a cliche I am [laughs]!
'I just love, love, love pickles now. Anything with vinegar I go crazy for - and ketchup, too. But I feel really, really good. I feel so lucky.'
Asked if she knows the sex of the baby, she said: 'I don't know. I don't do anything like find out the sex or pick names or get baby presents. But in the summer, all will be revealed.'