More of Nicole Richie's Pregnancy Mystery

Nicole Richie has further fueled pregnancy rumors by abstaining from alcohol at a showbiz party.

The 26-year-old - who allegedly received test results confirming she is pregnant two weeks ago - attended the Yves Saint Laurent Centre Dance Arts party at the Beverly Hills Hotel with boyfriend Joel Madden on Thursday night (14.06.07).

A source told the New York Daily News newspaper: "Nicole had everyone whispering when she declined alcohol."

'The Simple Life' star - renowned for her skinny frame - first sparked rumors after being photographed with an apparent baby bump.

A source told Life and Style Weekly magazine last week: "Nicole recently underwent a series of tests, including blood and urine screenings, which confirmed she is pregnant."

Nicole was photographed outside a reproductive clinic last month (30.05.07) - just days after her alcohol-fueled Memorial Day barbecue.