Rumer Willis wants her mother, Demi Moore, to start looking more mature.

The budding young actress wishes her 51-year-old parent would embrace her age and start to dress more appropriately.

A source told National Enquirer magazine: ''Rumer thinks her mom is gorgeous, but she also thinks Demi needs to start looking more mature.

''Demi is known for wearing sexy, thigh-high skirts, but she's turning 52 in November and Rumer feels she needs to lower her hemline.''

The 25-year-old is also worried Demi's latest toyboy, Sean Friday, a 27-year-old musician, could end up breaking her heart, like her second husband, Ashton Kutcher, who she split from in 2011.

The source added: ''Rumer is afraid that when Sean is ready to start a family he'll find younger woman - just like Ashton did with Mila Kunis.

''She knows how crushed Demi was when Ashton moved on, and she doesn't want her mother to go through that again.''