The pair have been splashed across the global press on a series of high-profile night outs in recent weeks, after the pop icon split from her husband Kevin Federline.
However, Hilton has dismissed suggestions that Britney's antics have made it impossible to be a proper mother to her two children.
Speaking in a posting on her MySpace, Hilton said: "Britney loves her kids to death, and I know for a fact that it truly hurts her when she sees these cruel things being written about her. She goes home every night to her babies and partying has not come in the way of her parenting. For people to call out her parenting skills on behalf of her partying ethics is appalling.
"Anyone who has called her out on this should really be ashamed. She's young, and if she wants to go out and have some fun, let her. Just because she does these things does not mean she doesn't care about her children. There are thousands of mothers out there who like to go out and have a good time. But, you do not see people out there calling them 'bad parents'. For the sake of Britney and her kids, be kind."
Britney herself released a statement on her official website recently, promising fans they could expect to see a "new me" in 2007.
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