Justin Bieber Image Credit: Reuters

Justin Bieber has undergone a paternity test to prove that he is not the father of fan Mariah Yeater's four-month-old son.

Femalefirst.co.uk reports that the 17-year-old singer took the test at a lab on Friday under very controlled circumstances, which means it will be hard for Yeater or her lawyer to challenge it.

The singer's team will not settle or even discuss settlement with Yeater or her legal team and it is now up to her to provide DNA results from her son.

Although she has dropped the lawsuit against Bieber, Yeater plans to pursue the matter privately.