A source told Britain's Daily Mirror newspaper: "Sam took Lindsay shopping as part of her birthday present. Although Lindsay is the major breadwinner, Sam has her own money and is very proud. "It's not an engagement ring - simply a token of her commitment. Lindsay is thrilled and she and Sam are very content." Yesterday, it was revealed Lindsay's partying ways have been curbed by her girlfriend.

A source said: "Sam and Lindsay are inseparable. Sam has been a really good influence on Lindsay. There is no one else special in Lindsay's life apart from Sam but it has taken her a while to feel like she can talk about their relationship. "Lindsay hasn't dated any men since she started hanging around with Sam, and there has hardly been a day in the last two months when they have been apart."

Lindsay - who spent time in rehab last year to be treated for alcoholism and drug addiction - spoke about her relationship with Samantha, the sister of super-producer Mark Ronson, as she celebrated her 22nd birthday last week.

The actress said: "I just want to live a happy, healthy year, continue on the path that I've been on and be with the person that I care about, and my family."