Every celeb's worst nightmare must be public questioning over the paternity of an unborn child.
Anna Nicole Smith endured months of doubt and up to five possible candidates while Eddie Murphy's ex, Melanie Brown, recently took the actor to court.
The latest 'Whose is it?' scandal involves Nicole Richie - who is apparently in a loving and monogamous relationship with Good Charlotte front man Joel Madden.
According to the National Enquirer magazine, Nicole was involved in open relationships with up to four different men at the time of the baby's conception.
The star, who has been engaged to DJ AM and dated Brody Jenner in the past, is now said to be prepared to undergo paternity tests to determine who is her baby-daddy.
A source told the tabloid that Nicole is 100 percent certain she is expecting, saying, "Nicole recently underwent a series of tests, including blood and urine screenings, which confirmed she is pregnant."
"The Simple Life" star is yet to publicly confirm the pregnancy reports, despite sporting a visible baby bump on her tiny frame and not denying the persisting rumors.
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