Looks like Olivia’s little sister is heading to Boston, and bringing some issues of her own with her. Ausiello just scooped that Ari Graynor (The Sopranos, Nick & Norah’s Infinite Play List) has been cast as Dunham, Jr. on Fringe:

Graynor will appear in a minimum of three episodes, the first of which airs in January. Per a Fringe insider, Graynor’s character pays Olivia a surprise visit and ends of crashing at her place for a few weeks. “She’s dealing with some man trouble back home,” the insider explains. “But the exact nature of that trouble isn’t clear.”

‘Lil sis also has a ‘lil travel companion: a daughter.