"[I'll send] something from the girls," Richards said on the Valentine in the Morning radio show Friday when asked about Sheen's upcoming nuptials.
The Two and a Half Men star and real-estate investor Brooke Mueller are getting married Friday in Los Angeles.
Richards won't attend the event, but the ex-couple's daughters, Sam, 4, and Lola, who turns 3 next month, will be there, she said.
"At the end of the day, he's their dad," she said of Sheen. "They have to understand that."
Sheen and Richards, who stars in the new reality show Denise Richards: It's Complicated, have been locked in bitter disputes over everything from the children appearing on the show to visitation rights after the divorce. Still, when Sheen and Mueller got engaged last year, Richards sent her best wishes to the couple. "I am genuinely happy for the two of them," she said at the time.