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When Valerie Bertinelli tied the knot yesterday evening, she was surrounded by costars old and new.

Attending Bertinelli’s nuptials to longtime boyfriend Tom Vitale were the actress’ current “Hot in Cleveland” costars Wendie Mallick and Jane Leeves, and also her “One Day at a Time” costars.

Serving up toasts at the Malibu celebration were Pat Harrington, who played “Schneider” on the hit 70s show, as well as Bertinelli’s former onscreen sister, Mackenzie Phillips, who got choked up when raising a glass to her “little sister.”

As noted before, Bertinelli’s first husband, Eddie Van Halen, was also at the wedding.

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Reality star and blogger Tila Tequila has committed to appear on the next season of “Celebrity Rehab,” a source confirms to Gossip Cop.

While the nature of Tequila’s alleged addiction is unknown, we’re told she is definitely signed on to the televised treatment.

However, the program, on which Dr. Drew helps celebrity addicts, could face cancellation or a long hiatus if producers can’t assemble a full roster of patients.

The most recent season included Heidi Fleiss, Mackenzie Phillips, and Dennis Rodman.

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A rep confirms to Gossip Cop that Chynna Phillips returned home yesterday from rehab, where she was dealing with anxiety.

“She’s home and doing great,” says Phillips’ rep, adding that the singer is celebrating her daughter Jamison‘s 10th birthday today. (Jamison is Phillips’ and Billy Baldwin‘s oldest child.)

Last year, Phillips’ half-sister Mackenzie Phillips claimed to have a longstanding sexual relationship with their father, John Phillips of The Mamas and The Papas. Chynna publicly supported Mackenzie while appearing on The Oprah Winfrey Show.

A little less than two weeks ago when Chynna Phillips checked into rehab, a source close to her told Gossip Cop she’s been “having a hard time since the summer, since [Mackenzie's] book came out.” The source added, “It’s been tough on her.” Gossip Cop was further told, “She’s really depressed,” and went to rehab “to figure out things” while receiving help for anxiety.

The same source explained Phillips “has a big heart” and was “trying to do the right thing” for her half-sister, but in retrospect felt some of what she said in support of Mackenzie wasn’t consistent with her thoughts on the matter.

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Chynna Phillips has entered a rehabilitation facility for anxiety, her representative confirms to Gossip Cop.

Last year, Phillips’ half-sister Mackenzie Phillips made waves by revealing a decade-long sexual relationship with their father, John Phillips of The Mamas and The Papas. Chynna publicly supported Mackenzie while appearing on The Oprah Winfrey Show.

But a source close to Phillips tells Gossip Cop she’s been “having a hard time since the summer, since [Mackenzie's] book came out.” The source adds, “It’s been tough on her.” We’re told, “She’s really depressed,” and “trying to figure out things” while receiving help for anxiety.

The same source tells Gossip Cop that Chynna Phillips “has a big heart” and was “trying to do the right thing” for her half-sister, but in retrospect feels some of what she said in support of Mackenzie wasn’t consistent with her thoughts on the matter.

Phillips has three children with husband Billy Baldwin.

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Joy Behar got a HUGE scoop today.

On Behar’s HLN show, airing tonight, Mackenzie Phillips reversed what she had said in her book, “High on Arrival,” about having consensual sex with her father, John Phillips of the Mamas and the Papas group.

As you may recall, Phillips claimed in September that, as she faded in and out of consciousness on a drug-fueled night before her wedding to Jeff Sessler, she and her dad had sex, and then afterwards continued for years sleeping together in what she described as a “consensual” sexual relationship.

Now she changed her story, and Behar got the exclusive.

“I’d like to reframe my word, ‘consensual,’” Phillips told Behar.

She explained, “As I was writing the book, I thought, this word, it kept sitting wrong with me, but I used it for lack of a better word, and since then I’ve been schooled by thousands of incest survivors all across the world that there really is no such thing as consensual incest due to the inherent power a parent has over a child… So, I wouldn’t necessarily call it a consensual relationship at this time.”

A source tells Gossip Cop Behar had no idea Phillips would reverse herself on air, but was “excited she got the scoop.”

And a big scoop it is.

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Gossip Cop might have launched at just the right time, because 2009 was a year of unbelievable pop culture shocks. From stunning deaths to stunning scandals, the decade ended with a series of jolts no one saw coming.

We’ve come up with seven of the biggest stories from what was an incredibly surprising year, and we’d like you to vote on which stands as the Biggest Shocker of 2009. Feel free to add your own nominations and thoughts in the comments section!

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UPDATE – 10:18PM

“I had sex with my own father.”

Mackenzie Phillips will reveal tomorrow on Oprah that her father, Mamas and Papas founder John Phillips, raped her, Gossip Cop has learned. The interview coincides with the release of her memoir, “High on Arrival.” Already it’s been revealed in promos for tomorrow’s program that her father introduced the “One Day at a Time” star to drugs. She recalls, “My father shot me up for the first time.” She also discusses Mick Jagger‘s attempt to seduce her and other long-held secrets.

But the most stunning revelation is that John had sex with a drugged-out 19-year-old Mackenzie as she faded in and out of consciousness on the eve of her wedding to Jeff Sessler in 1979. According to a leaked copy of the book, when she later confronted him about it, she said, “We have to talk about how you raped me,” to which he responded, “You mean when we made love?” The two had a long-term incestuous relationship, the memoir reveals.

Earlier this afternoon Oprah tweeted, “Interviewed One Day at a Time’s Mackenzie Phillips. Thought I’d heard it all … beyond shocking! We’re airing it Wednesday.”

We contacted Harpo Productions, and they did not get back to us. We also exchanged a series of e-mails with Simon & Schuster, the memoir’s publisher, explaining that we had heard the book’s big secret was that Mackenzie and John Phillips had a long-term sexual relationship. We have now confirmed it.