Renée Zellweger
It took decades, but Renée Zellweger finally acknowledged her humble beginnings as Jenny in Texas Chainsaw Massacre: The Next Generation (1995) alongside co-star Matthew McConaughey, who played a viscious psycopath with a mechanical leg. "Best workout ever," Zellweger said of the slasher flick. "Live chainsaw—that's some motivation to get running! Fast!"