Evangeline Lilly and boyfriend Norman Kali are expecting their first child.
The former Lost actress was photographed by US Weekly looking heavily pregnant as she vacationed in Hawaii.
However, the star's representatives have not issued an official statement.
Lilly, who previously confessed that she likes being a loner, dated Lost co-star Dominic Monaghan from 2004 until 2009.
The pair were rumoured to be considering adoption a child in 2006, but broke up temporarily shortly after the reports surfaced.
Lilly revealed in June 2010 that she is writing a children's book, which she hopes to have published at a later date.
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