Valerie Harper stars in “Looped” at the Lincoln Theatre Written by DCist contributor Monica Shores There are two stars in Arena Stage’s new production, Looped. Audiences might be drawn to the show for the familiar name above the marquee, TV actress Valerie Harper. But the play’s real star is her character, film actress Tallulah Bankhead, a woman notorious for unapologetic appetites and ego. Both women are captivating, and it’s hard to tell where one…