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And what did SamRo do instead? Party it up in LA!

Lindsay Lohan is currently at the Betty Ford Center in Palm Springs rehabilitating and Sunday is (the one and only) Visitor's Day.

An insider close to the 24-year-old starlet tells X17online exclusively that Lindsay "was begging Samantha Ronson to come and see her, but Sam was too busy partying with her new lady at her gig."

That ongoing gig is Take 'Em To Church Sundays at On The Rox on Sunset where Samantha DJs - and she had her latest ladylove, Liat Baruch, by her side all night!

Meanwhile, the only person to visit Linds was her assistant Elinore.

Other no-shows at Visitor's Day? Mom Dina - who's reportedly back in NYC - as well as siblings Michael and Ali. LiLo's support group is almost completely disappearing these days! Or is that an intentional move while the starlet stays in rehab... for the fifth time? Either way, it looks like Lindsay has a lonely month ahead of her.