U.S. pop singers Janet Jackson and Kelly Clarkson revealed their weight loss secrets recently to "Entertainment Tonight."

Jackson, who noticeably gained weight earlier in the year, told ET that she actually gained it for a film she was supposed to do.

After the project got pushed back to make time for as new album, Jackson said she began working to lose the weight. "I worked really hard, and I continue to work very hard," she said.

Jackson's fellow singer Kelly Clarkson revealed that she makes a real effort to stay healthy on tour. She told ET she had completely given up sugary sodas and hired a chef to prepare fresh, organic food while on the road.