Hello, how did I not know there was a lesbian storyline in “The Jane Austen Book Club?” (Clearly I haven’t been reading Best. Lesbian. Week. Ever. closely enough.) I checked out the trailer yesterday and had a “My God, did I just see two women in the tub?!” moment where I thought I had on my gay goggles and was imagining a Sapphic scenario. But, no, later in the trailer, bam!, unmistakable girl-girl goodness. Don’t you just love it when lesbians pop up in the most unexpected places? (Innuendo intended, it’s just so much more fun that way.)The film (opening Sept. 21) is an adaptation of the best-selling book by the same name about five women and a man who gather to discuss Jane Austen’s fiction and realize their lives are like a 21st century version of her novels. The cast looks great: Maria Bello (love her!), Emily Blunt (her, too!), Amy Brenneman (ditto, et al), Kathy Baker and Lynn Redgrave. Lost’s Maggie Grace (don’t know her, but I’m sure I’ll find a way to love her) plays Allegra, the lesbian daughter of Brenneman’s character. Heck, I don’t even care that she is named after an allergy medication. I just care that for about four seconds in the trailer she plays doctor with her girlfriend. You saw the stethoscope, right? I know I did.The trailer looks pretty good. It mixes lightness and laughs with lust and loneliness without even a smidge of the “we are mysterious creatures aren’t we”-pretentiousness wafting through the trailer of that other film out now with a killer ensemble cast (Yes, “Evening,” this means you). Plus, it’s a whole movie about a bunch of women who read books. Hell, what’s not to love?