The Wedding Crashers star wed Borat creator Cohen in 2010 and the pair has two children together, but she confesses that his personal blunders sometimes get him into trouble.
She tells British newspaper the Sunday Mail, "My husband's faux pas at social functions are really fabulous. Once, at the Golden Globes, he asked Cate Blanchett what she did for a living.
"Another time Jack Black invited him to a screening of a movie but before it started, this heavy-set lady gave a really long speech. Then Jack got up at the end and just thanked everyone for coming. Sacha asked why Jack had made such a short speech and told him he should have 'shut up the lady with the massive boobs'. Jack said she was his mother.
"So Sacha said, 'Well, Isla always wanted to have big boobs!' He was trying to deflect things."