The beauty, who played Kate Austen on the hit show, was spotted in Hawaii with a huge baby bump that suggests she is only weeks away from giving birth.
In the photographs, the 31-year-old, who is dating Lost production assistant Norman Kali, has covered her bump with a long blue paisley dress.
Wearing flip-flops, she appears to be suffering the curse of the expectant mother - swollen ankles.
The pretty brunette was also caught having a snack on the move, and seemed utterly shocked to be rumbled after hiding away successfully for so long.
Representatives for the actress have refused to comment, but Lilly has been vocal about her desire to have a baby in the past.
