Diane Lane was desperate to be liked by her Secretariat co-star - the film's lead horse.
At the movie's Hollywood premiere, the actress revealed how badly she had wanted to be friends with the equine actor.
"It's that thing where actors are so insecure they need to be liked in their profession, imagine with 1200 pounds, you really, really need to be liked," she joked.
"He either was a great actor and acted like he liked me and I fell for it, or we really had a bonding moment!" she said.
In the film, based on a true story, the actress plays female race horse owner Penny Chenery whose horse, in 1973, became the first in 25 years to win the Triple Crown of Thoroughbred Racing.
With a real-life passion for horses, Diane revealed it had been a dream role.
"My rocking horse was Pegasus and my first paintings when I was a kid were of horses," she explained.
"I actually won a contest where Bloomingdale's made a rug out of my drawing and it was of a horse - so there you go, it was a proud moment," she laughed.