X17 X17CLUSIVE - IT'S OVER! SAM LOCKS LINDSAY OUT OF HER HOUSE!!!!

X17online can confirm it's O-V-E-R for Lindsay and Sam! At least for now ...

We're not sure if it's just coincidence but during Lilo's pal Lily Allen's visit to LA, Samantha decided to kick Lindsay to the curb! And the breakup definitely wasn't amicable - Sam locked Linds out of her house, literally!

SamRo had a locksmith at her house yesterday changing the locks to her Hollywood Hills house where she and Lindsay have living together for at least six months.

And our own reports offer more detail about Sam's Lindsay lockout last night at Bar Chateau ...

Sources tell X17online.com that Lindsay was doing everything she could to get into Sam's sis' party -- including an attempt to scale the wall!:

Eventually Lindsay's friends, the D squared designers who were staying at the Chateau, took pity on her and said they would look after her so they let her into their rooms. But the minute they let her in, Lindsay tried to sneak into the party again! Poor girl just couldn't get in ..."

Check out the video of Sam's locksmith coming to effect Sam's Love LockOUT on Lindsay yesterday before the party ...