No party girl Lindsay Lohan

Lindsay Lohan's partying ways have been curbed by girlfriend Samantha Ronson. The 'Mean Girls' actress - who recently announced she is dating the DJ - is besotted by Samantha and just wants to spend nights in with her.

A source told Britain's Daily Mirror newspaper: "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. "It's really sweet that Lindsay has found someone she can trust and rely on."

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.

Lindsay 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." Sam - who enjoyed a day out with Lindsay and her family at Disneyland, in California, over the weekend - also posted pictures of her and the star kissing on her MySpace page. Recent reports claim Lindsay plays the submissive 'wife' in the relationship.

A source said: "Lindsay and Samantha are totally playing house and loving every minute of it. And, yes, they share a bed! "They both play certain roles. Lindsay is the passive one, the wife. It works for them!"