Natalie Portman was a late bloomer. The actress, who stars opposite Tobey Maguire and Jake Gyllenhaal in the upcoming film, “Brothers,” tells Marie Claire that she wasn’t the most socially active teenager. “OK, so I didn’t really go to high school parties,” she tells the magazine. “I didn’t touch pot ’til I was in my 20s. I didn’t get flat-out drunk until I went to college [Harvard]. But I think that’s a good thing in many ways.”