Watch Mariah Yeater in this “The Insider” video clip, where she rehashes the events from her fling with Justin Bieber. Yep, she says, Bieber got her pregnant backstage at a concert.

Yeater claims, “He immediately took a liking to me,” adding that once they got someplace private, “His whole demeanor changed… It went from being cute and gushy to… more aggressive.”

Uh huh. Suuuure.

First up, news that Jesse James not only cheated with tattoo model Michelle McGee… another woman has come forward to spill the beans that she also had an affair with James while he was married to Sandra Bullock.

Stripper Melissa Smith has come forward to talk about a two-year relationship with James. Let’s see how many others crawl out of the woodwork.

Usmagazine.com reports a source saying of Jesse James’ cheating ways: “This is not an isolated incident. When Sandra is away, he gets bored.”

Usmagazine also reports sources saying that Jesse’s cheating ways were no secret at his West Coast Choppers bike shop, with one reporting that James would answer ads and invite girls to his office.

In the video clip above, we get more details about how Sandra Bullock discovered that hubby Jesse James was cheating on her… Bullock’s publicist broke the news to her when mistress Bombshell McGee came forward with the story.

And speaking of McGee, her ex-husband was on The Insider last night to spill more beans about his ex – he claims she destroyed another marriage by having a relationship with a friend’s husband.

And where’s Sandra Bullock during all of this? After canceling overseas promotional appearances for her film The Blind Side, it seems Bullock has gone into hiding.

And who wouldn’t want to escape from the media given Jesse’s affair (or affairs, as the case may be)?

No one knows where Bullock is at present, but no doubt she is getting some much-needed time away from the situation.

He’s none-too-happy, swearing at her, telling everyone “fuck you” and walking off the set.

Jon says he’s “not doing it for the money. I’m doing it to restore family values,” when asked why he’s shutting down Jon & Kate Plus 8 now.

Nancy Grace sharply returns: “Say what? Do you think that dating Hailey Glassman when your divorce is not settled that you’re restoring family values?”

Awwwkward!

What did you think of the Nancy Grace/Jon Gosselin face-off on The Insider? She barked, he whimpered and tried to dance around the claim of doing what’s best for his kids.

Lara Spencer, host of “The Insider,” said on today’s “The Early Show” that Jon wants to deny TLC permission to videotape his kids.

According to ‘The Insider, Jon Gosselin’s attorney, Mark J. Heller, has sent two cease and desist letters.

Spencer relays: “In two letters to TLC lawyers, dated September 29, 2009, Gosselin demands the network cease and desist production and leave his property. I want to quote one of the letters, Jon’s attorney writes, ‘Effective immediately, no production crews are to enter Jon’s family home for any reason. In the event that anyone enters the marital property, Jon Gosselin will notify the local authorities to effectuate police action against any trespassers.’ ”

Since Jon also owns the house that Kate Gosselin and the kids live in and has joint custody, he can make decisions about the welfare of the children.

So, when did all this Jon Gosselin shutting down Kate Plus 8 production go down? The very day that TLC sent a news release that the show was renamed and Jon’s participation was being downsized.

“Jon found out about the name change the same way we all did — through The Associated Press,” Spencer says. “He and his attorney assert to ‘The Insider’ they’ve been in discussions to pull plug on the program and take the kids off the show for weeks prior to (Tuesday’s) announcement.”

Instead, a source tells PageSix.com that Pat O’Brien will be dropped from The Insider and temporary replacement Donny Osmond will take over.

Pat O’Brien is currently undergoing rehab treatment that he started on February 8 to “maintain his sobriety.”

A rep for The Insider would not confirm the Donny Osmond replacement rumors, saying, “Pat O’Brien is focused on his recovery in rehab, and it’s inappropriate to comment on rumors about the show.”