Bratty blonde Lindsay Lohan’s Fashion Week antics made her unfashionably unwelcome at Marc Jacobs’ after-party at the Dream Downtown hotel on Thursday night.

After throwing a drink at a photographer the previous night at the Top of the Standard during the V Magazine Black & White ball, Lohan was thrown out of Jacobs’ bash at the newly opened Gallery at the Dream Downtown.

Witnesses told us that when a friend of Lohan’s tried to approach door staff at the Jacobs party to let her inside, she was rebuffed several times. “It’s not going to happen,” event organizers repeated.

PHOTOS: LINDSAY LOHAN

So Lohan called on her pal, Dream owner Vikram Chatwal, who walked her into the event. She took a seat in a booth near Dakota Fanning, who stars in Jacobs’ ad campaign for his Oh, Lola! fragrance.

But moments later, spies said security approached Lohan and told her she wasn’t welcome. The starlet was then bounced from the venue while Juergen Teller, Michael Pitt, Mischa Barton and Fanning partied on.

Lohan trotted around the corner to the Electric Room, also in the Dream Downtown, where she was allowed in. There, she was spotted mingling around the small lounge but retreated to a corner booth once A-listers and fashion royalty including Mick Jagger, L’Wren Scott, Rachel Zoe, Owen Wilson, Vladimir Doronin and Courtney Love walked in.

“The second these people walked in, she kept to her table,” observed one partygoer. “She apparently realized more important people were in the room.”

Lohan’s bad behavior at Fashion Week is also said to include holding up the Indashio show for an hour because she refused to get out of her car.

A Lohan rep said he had “no knowledge of either of these incidents” and was “unable to reach Lohan for clarification” by deadline. A rep for the Dream had no comment.