Melissa McCarthy showed off her 45-pound weight loss at an event for the P.S. ARTS Express Yourself in Santa Monica, Calif. over the weekend.

The Tammy star has reportedly achieved the weight loss by altering her diet to low-carb, high protein, something she did to set a good example for her children; Vivian, 7, and Georgette, 4, rather than giving in to Hollywood pressures.

''She's been making small changes and seeing big results. It's given her a real confidence boost,” a source told Life & Style, adding she “realized she wasn't being as healthy as she could be.”

McCarthy looked confident at the event, wearing black Chuck Taylors, black jeans and a vibrant jacket. She also seemed to be happier than ever as she posed for photos on the red carpet.

The Mike & Molly star has been open about her body image in the past, telling People, “I've never felt like I needed to change. I've always thought, 'If you want somebody different, pick somebody else.' "

She added of her daughters with husband Ben Falcone, "I want my girls to know what's real, that how you should or shouldn't look – all of the 'shoulds' – it applies to no one," she said. "It's not real. It's made up."

image via INFphoto.com