"But before I could say anything Russell Crowe just turns to me and says, 'f*** off'.
"So I just put my head down and walked away. But thanks Nicole."
Wilson's interview with Leno comes several days before her gig hosting the MTV Movie Awards on April 14 on Los Angeles.
She said the experience is pretty "full-on".
"I haven't really hosted anything before except for my own intervention for addiction to hard cheeses," Wilson joked.
The awards show will see Wilson mingling with some of Hollywood's biggest stars.
But she says out of all the "massive mama celebrities" attending, she's most excited to meet Brad Pitt.
"I've only met him once before," she said.
"OK, I didn't really meet him I just kind of stood behind him and smelled his hair.
"It smelled really good."
- AAP