Justin Bieber Takes DNA Test

If Justin Bieber looked especially relaxed at last night's American Music Awards - singing "Under the Mistletoe," posing on the red carpet - there was a good reason for the singer's positive mood:
He reportedly took a DNA test Friday, as Bieber looks to officially clear his sperm and end talk that he's the father of Mariah Yeater's child.

Justin Bieber doesn't look too worried about anything other than making Selena Gomez happy, does he?

A source tells TMZ that Justin took the test at a lab under "very controlled circumstances." From here, assuming the results prove he is NOT the daddy, Bieber's team says he will sue Yeater for defamation.

Meanwhile, shortly after taking the test, Bieber rehearsed in Los Angeles for his AMA performance - and witnesses say he paid especially close attention to a certain member of the crowd throughout the evening: Selena Gomez.

"At one point Justin even sang I Feel Good, a la James Brown! They were totally adorable," an onlooker reports of Justin and Selena. "They were snuggling in between takes, and he was serenading her! They look as in love as ever."

AWWWW!

Thanx to TMZ