Victoria Beckham's little sister Louise confronts her over her shock weight loss, Katherine Chatfield reports.

One lives in a $25 million mansion in LA with her famous footballer husband and is always seen draped in designer brands. The other is a divorced mum-of-three who lives around the corner from her parents and works hard to ensure there's food on the table.

Their lives are a million miles apart – yet these two women are sisters.

Victoria Beckham and her younger sister Louise Adams grew up under the same roof, went to the same school and attended the same family gatherings, but their adult lives could not be more different.

While Posh, 35, is rarely out the spotlight, Louise, 33, prefers to live a quiet life, working for a small company in Essex, England, where she and Victoria grew up.

"You'd think it would be a rough deal to be the baby sister of Victoria Beckham, always in her shadow," says a family friend. "But Louise can hold her own against Victoria any day, and is very content with her life."

In fact, it's Louise's down-to-earth nature that prompted her to have a showdown with her big sister over her diminishing waistline.

"Louise will often tell Victoria when she's looking too thin, but she'll make a joke of it, saying something like, 'Oh, for God's sake girl, eat McDonald's or something – it won't kill you!'" reveals the friend.

"But Louise got a real shock when she flew to LA recently to see Victoria. She is used to her sister being skinny, but this time she actually gasped when she saw her. She sat Victoria down and told her she was really worried about her, and said she could barely hug her, as there was nothing to grab on to."