Drew Barrymore has posted candid photos and videos of her 20lb weight loss.

The actress shared the media as part of her Wellness Week on Instagram, which has seen her give her 12.8 million followers an insight into how she tries to live a healthy lifestyle, both in body and in mind.

While many celebrities credit specific diets and self-motivation for dramatic physical transformations, Barrymore happily revealed that her brilliant personal trainer was behind her weight loss.

Alongside a series of inspirational pictures, she posted a picture of herself and personal trainer Marnie Alton, writing: "This woman is my long time teacher and dear important friend. She has helped me. Healed me. Encouraged me to keep going when I felt like being strong was an insurmountable task".

Barrymore revealed that she's known Alton for 15 years, and Alton helped her to get her body where she wanted it to be for her role in the Santa Clarita Diet, saying, "I lost 20 pounds and trained like a mother."

"She also is the most amazing person. She is poetry in a human being. The best heart. Her priorities are in the right place. She is humorous and so so so knowledgeable about our bodies. I love her. Inside and out," she said, adding that Alton's classes are "always booked."

"We all love to run to her for her spirit and leadership for all things healthy. We hope the people in the wellness world are actually healthy in their hearts and minds. It's not all about being terminators! It's about how to find yourself. How to be your best self. But we need guidance and we hope our teachers are smart and wise and sane! Marnie is one of the greats. Period," she said.

The 44-year-old actress, who rose to fame as a child star in E.T., ended the sweet post by writing: "If [you're] looking for a life change or to find your consistent tribe, she is where I found mine."

In an interview with Women's Health, the actress explained that she struggled with her weight after becoming a mother.

"Everyone is different, and I have the genetic makeup of the Pillsbury Doughboy," she joked. "I have to fight so hard to be in shape or be in a smaller size or lower weight, and people don't talk about the fact that when you have kids, everything goes out but it doesn't always come back in. You never get your 'old' body back, you're working with a new body."

You keep doing you, Drew! You look fantastic.

Drew Barrymore has posted candid photos and videos of her 20lb weight loss.

The actress shared the media as part of her Wellness Week on Instagram, which has seen her give her 12.8 million followers an insight into how she tries to live a healthy lifestyle, both in body and in mind.

While many celebrities credit specific diets and self-motivation for dramatic physical transformations, Barrymore happily revealed that her brilliant personal trainer was behind her weight loss.

Alongside a series of inspirational pictures, she posted a picture of herself and personal trainer Marnie Alton, writing: "This woman is my long time teacher and dear important friend. She has helped me. Healed me. Encouraged me to keep going when I felt like being strong was an insurmountable task".

Barrymore revealed that she's known Alton for 15 years, and Alton helped her to get her body where she wanted it to be for her role in the Santa Clarita Diet, saying, "I lost 20 pounds and trained like a mother."

"She also is the most amazing person. She is poetry in a human being. The best heart. Her priorities are in the right place. She is humorous and so so so knowledgeable about our bodies. I love her. Inside and out," she said, adding that Alton's classes are "always booked."

"We all love to run to her for her spirit and leadership for all things healthy. We hope the people in the wellness world are actually healthy in their hearts and minds. It's not all about being terminators! It's about how to find yourself. How to be your best self. But we need guidance and we hope our teachers are smart and wise and sane! Marnie is one of the greats. Period," she said.

The 44-year-old actress, who rose to fame as a child star in E.T., ended the sweet post by writing: "If [you're] looking for a life change or to find your consistent tribe, she is where I found mine."

In an interview with Women's Health, the actress explained that she struggled with her weight after becoming a mother.

"Everyone is different, and I have the genetic makeup of the Pillsbury Doughboy," she joked. "I have to fight so hard to be in shape or be in a smaller size or lower weight, and people don't talk about the fact that when you have kids, everything goes out but it doesn't always come back in. You never get your 'old' body back, you're working with a new body."

You keep doing you, Drew! You look fantastic.