The American Pie star underwent a botched liposuction procedure in 2004 and vowed never to take off her clothes for the men's magazine - because she was too insecure about her figure.
Reid told reporters, "I know there are problems with my stomach. There are bumps on it, it's uneven."
However, the 33-year-old is now flaunting her figure, according to In Touch magazine. She reportedly posed entirely nude for a Playboy shoot at a private residence in Santa Monica, California earlier this month.
A source says, "She was a bit insecure about her body when they first started. She looked great and finally got into the groove."