'Gossip Girl' Blake Lively's brother made her do WHAT?

Blake Lively blames her brother Eric Lively, 27, for forcing her to become an actress.

He took Blake out of school at age 15 and took her on a cheapskate version of the European "grand tour."

According to W, "somewhere between Cambridge and Cologne, he told her she should try acting."

"He was trying to get me to make life decisions at 15!" she tells the mag.

But the cheerleader, class president and member of the high school "show choir" was more interested in attending Stanford University than making movies.

Eric -- who has appeared in "24," "The Nine," "The L Word" and "American Pie" -- secretly contacted his agent about little sis a year later.

"I was really busy at school," she told W, "and I would have these agents calling and saying, 'We have an appointment for you.' It was really hard to say no, because I didn't want to make my brother upset."

Eric, "Gossip Girl" fans everywhere salute you!

OK, now on to more important "GG" matters. Is anyone else tired of Serena's weenie faux artist new kinda boyfriend who told her last night that he wasn't into exclusivity?  Dump him, S! Your thoughts?

And will LIttle J end up turning tricks to support her fashion designer dreams? Hey, it could happen in real life, why not on "GG"? Click here to read Enid Portuguez's take on last night's episode in Show Tracker.

Photos: Blake Lively gets red, white and blue for W.