What Is Going on Between Charlie Sheen and Denise Richards?

The on-again, off-again amicable relationship between Charlie Sheen and his ex-wife Denise Richards – in which they were once so close that Richards was caring for Sheen’s children with another woman – has once again turned vitriolic.

Denise Richards: Charlie Sheen & I 'Actually Enjoy Hanging Out'

A week after calling Charlie Sheen the “greatest ex,” his former wife Denise Richards is speaking about her relationship with the Anger Management star.

“My situation with Charlie is that we’ve gotten along for quite some time now, and it’s much better, I think,” she told reporters at Corolle’s Adopt-a-Doll Event in Los Angeles on Saturday.

Richards, 42, said that the former couple remain focused on their daughters, Lola, 7, and Sam, 9.

Denise Richards: Why She's Caring for Charlie Sheen's Kids with Brooke Mueller

The knock on the front door of Charlie Sheen’s troubled ex-wife Brooke Mueller’s home came around 9 p.m. on May 2. Social workers from L.A.’s Department of Child and Family Services, alarmed by Mueller’s erratic behavior in recent weeks, had arrived for one explicit reason: to take custody of her two 4-year-old twins, Bob and Max.

“It was a real mess,” says a Sheen friend familiar with the incident.

But what happened next came to many as a shock.

Brooke Mueller Enters 'Long-Term, In-Patient Treatment Center'

Brooke Mueller may finally be getting the help she needs.

Charlie Sheen’s ex wife has checked herself into a “long-term, in-patient treatment center” following a recent arrest for alleged cocaine possession and assault, her rep Steve Honig says in a statement.

Brooke Mueller's Lawyer Wants 'All Charges Dropped' in Latest Drug Arrest

Despite a drug-related arrest over the weekend, Brooke Mueller’s camp is confident she’ll come out of this debacle unscathed.

“[Mueller’s lawyer Yale Galanter] “will vigorously defend Brooke with the goal of having all these charges dropped once the facts of the case come to light,” Mueller’s rep Steve Honig says in a statement.

Brooke Mueller 'Can't Stay Sober on Her Own': Source

What’s next for Brooke Mueller, besides her Colorado District court date on Dec. 19?

Mueller, the 34-year-old ex-wife of Charlie Sheen was arrested Friday night in Aspen for cocaine possession and assault, a spokeswoman for the Aspen Police Department confirmed to PEOPLE.

But while the court will ultimately decide what is to become of Mueller, a source close to her tells PEOPLE: “Brooke can’t stay sober on her own.”

Brooke Mueller Arrested for Cocaine Possession and Assault

Charlie Sheen’s ex-wife is facing personal troubles again.

Brooke Mueller, 34, was arrested Friday evening in Aspen, Colo., for cocaine possession and assault, Blair Weyer, a spokeswoman for the Aspen Police Department, confirms to PEOPLE.

Paris Hilton: Brooke Mueller Makes My New Show 'Very Dramatic'

No stranger to eyebrow-raising scenarios, it only makes sense that Paris Hilton calls her new Oxygen series “very dramatic.”

But it’s not just Hilton who brings intensity to the small-screen in her latest reality TV venture. The socialite says when her show premieres June 1, viewers will see “everything” unfold with her tabloid-friendly pal and costar Brooke Mueller, who has been fighting addiction publicly while battling her ex, Charlie Sheen.

Charlie Sheen in Court to Fight for Custody of Sons

Charlie Sheen may be winning onstage – but will he win in family court?

The actor, 45, arrived in Los Angeles Superior Court Tuesday morning to seek full custody of his twin boys, Bob and Max, 2, with Brooke Mueller, the actor’s lawyer Mark P. Gross confirms.

Charlie Sheen's Twins Celebrate Birthday – Without Their Dad

Charlie Sheen’s “winning” ways didn’t score him an invite to his sons’ birthday party.

The troubled actor’s boys, Max and Bob who turn 2 on Monday, celebrated at a party Sunday with their mom, Brooke Mueller, and about 50 guests.

“The party is a casual and child friendly celebration,” a source tells PEOPLE of the bash at Kathy and Rick Hilton’s Bel Air home. “It’s all about Max and Bob and their friends. They seem to be having a great time, and so is Brooke.”