Ryan O'Neal has taken a paternity test and RadarOnline.com has exclusively learned that he is not the father of the baby a woman claimed he was.

Jessica Zellars gave birth to a baby boy in February and a source close to her told RadarOnline.com that she believed that 70-year-old Ryan was the father of the child, but he has proven that indeed, he is not.

Ryan O’Neal recently got hit by claims that he fathered a child with a woman after a brief fling -- a charge he vehemently denies -- and he has agreed to take a paternity test to resolve the matter, which he believes will fully vindicate him, RadarOnline.com is exclusively reporting.

As we previously reported, Jessica Zellars has accused the 70-year-old Love Story star of fathering her two-month-old son, who she claims she conceived during their “brief romantic relationship.”

The question on everyone’s lips is -- will Khloe Kardashian take another DNA test, to prove that her father is Robert Kardashian?

A source close to the reality star tells RadarOnline.com that at present the 27-year-old has no plans to do so, but Khloe being Khloe, that could change!

PHOTOS: Kim Kardashian & Her Family Pose At The Annual Christmas Party

The controversy continues to intensify over Khloe's true paternity with neither side backing down. While Kris Jenner was on GMA denying Star magazine’s exclusive report quoting Robert Kardashian’s ex-wife and widow, Jan Ashley and Ellen Kardashian respectively, the women are standing firm behind their claims.

Justin Bieber has taken a DNA test to prove that he isn't the father of Mariah Yeater's son, RadarOnline.com has confirmed.

As RadarOnline.com and Star magazine previously reported, the 20-year-old woman filed a bombshell paternity suit against Bieber, alleging he is the father of her three-month-old baby.

Yeater filed court papers saying that her sexual encounter with the Baby hit-maker occurred on October 25 of last year, after he performed to a sold-out crowd at L.A.'s Staples Center.

Selena Gomez is hosting the MTV European Music Awards Sunday night and the most anticipated trophy of the ceremony will be going to her boyfriend Justin Bieber.

Selena appeared at a press conference Saturday promoting the event but there were no questions about Biebs or the paternity scandal that is swirling around him.

She smiled and was friendly and upbeat when talking about the awards ceremony, taking place in Belfast, Northern Ireland.

PHOTOS: Selena Gomez At The MTV EMA Press Conference

As RadarOnline.com has been reporting, 20-year-old Mariah Yeater has filed a paternity suit alleging Bieber is the father of her three-month-old child. She's asked the court to order a paternity test, and assuming a positive result, she wants child support from the singer.

Justin, 17 and Selena, 19, have been dating a year and on Friday, a source told RadarOnline.com Justin is denying he's the baby's father and Selena is standing by her man.

She'll be literally doing that during the show tomorrow when Justin is presented the MTV Voices Award.