It's been a tough week for Charlie Sheen. On Tuesday, [article id="1650850"]the 45-year-old actor was hospitalized[/article] after an "adverse" reaction to prescription medication. And on Monday (November 1), the "Two and a Half Men" star and wife Brooke Mueller filed for divorce citing "irreconcilable differences."

Back in May, Sheen and Mueller signed a 43-page settlement that divided all their assets and settled a child custody agreement. According to documents obtained by TMZ, the couple are seeking joint custody of their twins, Bob and Max.

In addition to physical custody, Mueller will receive $55,000 a month in child support. That monetary sum must be no less than the amount of support he is obliged to pay for his children with ex-wife Denise Richards, as the document reads, "Under no circumstances shall the child support paid by Charlie for Bob and Max be less than the child support paid by Charlie to Denise Richards for Sam and Lola."

The couple, who married in May 2008, have experienced their share of trouble, including a domestic dispute over Christmas at their home in Aspen, Colorado. Sheen had reportedly threatened Mueller with a knife and was charged with misdemeanor third-degree assault as a result of a plea deal. [article id="1632490"]He later entered rehab[/article] "as a preventative measure," according to a statement issued by his publicist.