(Cover) - EN Showbiz - Robbie Williams is reportedly so close to Britains Princess Beatrice he treats her like a sister.

The British singer is good friends with Sarah Ferguson, who is Beatrices mother. She introduced Robbie to her daughter and they have formed a close bond. The star has told Beatrice, 22, she is free to visit him at his Los Angeles home whenever she likes, and enjoys spending time with her.

Robbie gets on really well with Beatrice. He treats her like a little sister and looks after her. It's really sweet, a source told British newspaper The Sun.

Sarah also known as the Duchess of York is also a regular at the home Robbie shares with his wife Ayda Field. She met the 37-year-old star in January when they were both enjoying a break in the Caribbean and they got along famously.

She can now regularly be found relaxing at Robbies lavish home and he is only too happy to see her there.

A few of Robbie's soccer pals were round the other week and Fergie was just wandering about in her robe. She came and said hello and was really charming, the insider added.

Robbie likes having Fergie around and said she could stay as long as she liked.

Beatrice is Sarahs daughter with her ex-husband, Britains Prince Andrew. They also have 21-year-old Princess Eugenie together. (C) Cover Media