Lindsay Lohan and gal pal Samantha Ronson are like a "married couple", according to a source close to the pair.

The couple fuelled rumours that they are more than just good friends in May when they were snapped locking lips on a yacht in Cannes.

Since then, they have rarely been seen apart, and last week celebrated the actress's 22nd birthday at L.A nightspot Teddy's.

A friend paints a picture of domestic bliss between Linds and her DJ girlfriend.

"Sam and Lindsay are inseparable. Sam has been a really good influence on Lindsay,” the source tells The Mirror.

"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.

"They have been shacked up in Lindsay's place and they spend weekends like a married couple going to the supermarket together.

"It's really sweet that Lindsay has found someone she can rely on and trust."

Lindsay came closest to publicly acknowledging the affair when she told Ryan Seacrest last week that her future plans included to “be with the person that I care about.”