Justin Bieber's not the only one who's taken a paternity test lately. The number of paternity tests performed in the U.S. reportedly has been on the rise, with more and more would-be dads and uncertain moms taking advantage of DNA technology to provide a definite answer to the question, "Who's the father?"

But what if knowing the answer can do more harm than good? "What Would You Do?" tested this idea, hiring actors to play a pregnant teen, her boyfriend and her best friend. A paternity test has revealed to the teen that her boyfriend is, in fact, not the father of her child, and now she doesn't know whether to tell him the truth.

In the scenario, staged at the Cloverleaf Tavern in Caldwell, N.J., the teen and the friend discuss the situation while the boyfriend steps away. As unsuspecting bystanders get up-to-speed on the problem, we watch to see if anyone will offer advice to the girl or, perhaps, spill the beans to the boyfriend.

Vote to tell us what you'd do in this situation and watch the full scenario on "What Would You Do?" Friday at 10 p.m. ET.

VOTE: Would you tell a stranger that his pregnant girlfriend was not carrying his child?

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