Samantha’s twin sister, Charlotte Ronson, reportedly barred Lindsay from her “I Heart Ronson” fashion show on Friday night, leaving the starlet outside Bar Marmont, restrained by five security guards.

OK! says that when Lindsay tried to enter, she was reportedly “held back at the door by five bouncers,” because they were apparently under strict instructions to “look out for Lindsay” and “not to let her in under any circumstances.”

The magazine’s source says that before the show, the Ronson family had gone out of their way to keep the actress out: “Unless Lindsay rams a truck through the red carpet or skydives in, she won’t be here.”
And a source at the party confirms to E! that the Ronsons had asked Lohan not to attend.

As Sam DJ’d at the event, Lindsay retreated to her room at the Chateau Marmont. Lindsay then did the next logical thing: she Twittered about her failed relationship with Sam, accusing Sam of cheating, and adding that Charlotte needed lose “a stone or 10.”

@jackdaniels9 I was right all along. Cheat
about 21 hours ago from TwitterBerry

@jackdaniels9 being cheated on does wonders to you
about 10 hours ago from web

@jackdaniels PLEASE leave me ALONE. and stop staying in the room below me, you’ve woken me and my mother up. go to bed. keep cheating u win
about 10 hours ago from web

@jackdaniels9 look, im doing this publicly because u&ur friends call people mag..so-you win, you broke my heart. now go away. i loved you
about 10 hours ago from web

@jackdaniels9 please go away. & go to bed. u work hard, & u need some rest. those around u are clearly negative influences. miss u.be wellxx
about 9 hours ago from web in reply to jackdaniels9

@jackdaniels9 ask ur sister 2 stop yelling profanity plz;;stop doing drugs. and tell charlotte to do more-she could loose a stone or 10.
about 9 hours ago from web in reply to jackdaniels9

@jackdaniels9 oh- it’s like this? fine. Byebye
about 1 hour ago from web in reply to jackdaniels9

Sam kept a low-profile for the rest of the weekend. On Saturday, photographers snapped a locksmith changing the locks on the homshee used to share with Lindsay. Meanwhile, Lindsay stayed at the Chateau Marmont with her mother and sister.