Denise Richards says she and ex-husband Charlie are like "brother and sister".

The actress - who has two daughters, Sam, seven, and six-year-old Lola, with the former 'Two and a Half Men' actor - admits the pair enjoy a close relationship as they know it's important to get on for the sake of their children.

She told 'Access Hollywood': "It's our 'Modern Family' I suppose. We've actually become like brother and sister, we really have. We've become very, very good friends. When we all spend time together, it's great for the kids and for us too. We actually get along."

Although their break-up was initially acrimonious, Denise says they decided to put their problems behind them and concentrate on being good parents.

She said: I think the key is making it about the kids. The stuff between the couple... if you're divorced... it's no longer about you anymore. You have to be the bigger person and make it about the kids and so that's what we're doing."

Earlier this week, Denise and Charlie - who also has two-year-old twin sons, Bob and Max, with ex-wife Brooke Mueller as well as grown-up daughter Cassandra from another relationship - enjoyed a short vacation in Mexico.

The former couple took advantage of the public holiday in the US on Monday (16.01.12) to take a break with Sam and Lola, as well as Eloise, the actress' seven-month-old adopted baby girl.

Denise revealed the trip had not been planned, writing on her twitter page that they were going on a "spontaneous" break.

She wrote on Friday (13.01.12): "Going on a spontaneous trip with the girls this long weekend."