I may be the last Ugly Betty fan alive to come to this realization, but this morning as I read the news at Zap2It that Rebecca Gayheart has been cast in a May sweeps guest-starring role on ABC’s delectable dramedy, it hit me: the 90210 actress (last seen in the canceled Vanished, pictured at left) and Betty’s Emmy-worthy Becki Newton (at right) could pass as sisters. Which has to be what Betty‘s writers are secretly planning, no? (ABC says Gayheart will be a former flame of Alex(is) Meade… but there’s got to be more to the story.) Anyhow, I’m seeing big sis as the polar opposite of Amanda: Intellectually curious, wickedly successful (maybe a top editor at something like The Economist?), and disarmingly sweet. It’d be a hoot to see her befriend Betty and to watch Amanda struggle with the realization that she’s (gasp!) jealous of sharing her Queens-based nemesis.