The 30-year-old actress sparked the rumors after she was seen sporting a grey sweater and regular fitting jeans as she left a grocery store with beau Ashton Kutcher's mother on Wednesday.
According to the Daily Mail, Kunis's "choice of baggy clothing lately" is to blame for the pregnancy speculation.
The rumors intensified Tuesday night when Kutcher got into an argument with paparazzi after the couple left a restaurant on Melrose Ave. prompting TMZ to speculate he was trying to hide his pregnant girlfriend.
The Black Swan star and Kutcher began dating in April 2012 and the latter is reportedly "desperate" to start a family with his former That 70s Show co-star. The 35-year-old Two and a Half Men star recently finalized his divorce from ex wife Demi Moore.