Fans claim Serena Williams' Sports Illustrated cover was edited to make her powerful legs and body look slimmer

Serena Williams was named Sports Illustrated's 2015 Sportsperson of the Year, but many of her fans have say they were disappointed by her corresponding magazine cover in which they claim her thighs look noticeably 'slimmer'. 

After Sports Illustrated debuted the cover of its highly-anticipated annual issue on Monday, critics flocked to social media to comment on the size of the 34-year-old tennis star's thighs, while accusing picture editors of using Photoshop to make her athletic legs look smaller. Check out some of the tweets below..