Article courtesy The Star Ledger. “I look like an upside-down teacup in my costume,” says Mamie Gummer about the 1780s yellow satin frock she wears in “Les Liaisons Dangereuses,” playing a debutante seduced by the wicked Vicomte de Valmont. Maybe so, but between her elegant cheekbones, luminous skin and clear blue eyes, Gummer also looks a good deal like her mom, Meryl Streep. Gummer doesn’t mind questions about her celebrated progenitor. “I’m sort of resigned to it,” she explains with a deep heart-shaped smile just like You-Know-Who’s. Yes, Streep has been “really supportive” of her 24 year-old daughter’s career. No, Streep hasn’t been a pro-active stage mother. “There haven’t been any phone calls made for me,” Gummer declares. Currently in previews and opening May 1, Roundabout Theatre Company’s revival of “Les Liaisons Dangereuses” marks Gummer’s Broadway debut. But already she has enjoyed meaty roles in three off-Broadway plays – winning complimentary reviews as well as a Theatre World award – since graduating from Northwestern University in 2005. Between stage gigs, Gummer has appeared in several films like “Stop Loss” and “Evening” and the HBO series “John Adams” in which she portrays the President’s widowed daughter-in-law, Sally. “You can find me, like, oh, there I am over by the window sill,” she giggles about her marginal if sympathetic character.