United Kingdom, July 7 -- Denise Richards and Aaron Phypers have split after six years of marriage.

The 52-year-old actor has filed for divorce at Los Angeles' Stanley Mosk Courthouse, according to documents seen by Us Weekly.

Aaron cited "irreconcilable differences" as the reason for their split, and the date of their separation is listed as July 4.

In the court documents, the actor lists Denise's youngest daughter - 14-year-old Eloise, whom she adopted - as his stepchild, and he's asking the court to award him spousal support.

Aaron also claims that he's earned zero dollars over the past 12 months, after shutting down his business. On the other hand, he claims that Denise - who also has daughters Sami, 21, and Lola, 19, with ex-husb...