Sydney Sweeney felt a "bittersweet emptiness" after she finished filming Christy

The blonde beauty - who has enjoyed a meteoric rise in recent years - told Variety: "It was this bittersweet emptiness.

"You're so proud of the work that you did. It's a dream role. You just experienced six months of everything you've ever wanted. Then everybody gives hugs, kisses and you have to say goodbye to it forever."

Christy Martin was America's best-known female boxer in the 1990s, and Sydney developed a close bond with the former sports star during the shoot.

The actress was also conscious that her role was unlike anything she'd ever done.

Sydney - who got herself in tip-top physical condition for the role - shared: "I remember standing in front of the mirror - I still had the weight - and I was like, 'I'll never get to do something like this ever again.' It made me really sad. I don't know if I've actually navigated the ending of that yet, because we're still in press. I'm getting to watch the movie all the time. I'm with [real-life] Christy all the time."

Meanwhile, Sydney recently insisted that she doesn't "just make art for numbers".

The actress admitted that she feels "deeply proud" of Christy - even though it hasn't proven to be a commercial success.

Alongside a carousel of photos from the film, Sydney - who also co-produced the David Michod-directed movie - wrote on Instagram: "i am so deeply proud of this movie.

"proud of the film david made. proud of the story we told. proud to represent someone as strong and resilient as Christy Martin. this experience has been one of the greatest honors of my life.

"this film stands for survival, courage, and hope. through our campaigns, we've helped raise awareness for so many affected by domestic violence. we all signed on to this film with the belief that christy's story could save lives.

"thank you to everyone who saw, felt, and believed and will believe in this story for years to come. if christy gave even one woman the courage to take her first step toward safety, then we will have succeeded. so yes I'm proud. why? because we don't always just make art for numbers, we make it for impact. and christy has been the most impactful project of my life. thank you christy. i love you. (sic)"