New BFFs! Ashlee Simpson And Nicky Hilton Hit The Town Together

Who knew these two lovely ladies were so tight? Ashlee Simpson and Nicky Hilton left the Sunset Marquis together ... arm in arm.

The single Ms. Simpson, looking picture perfect with her blonde 'do, has never looked better!

Ash and Nicky were at the Marquis for the introduction to the new jewelry line ... Lia Sophia Industrielle II Collection.

Too bad Ashlee didn't bring her rumored boyfriend Boardwalk Empire actor Vincent Piazza to the event? Perhaps she doesn't want to parade her new man around until her divorce from Pete Wentz is finalized.

See more of Ashlee's feline-inspired fashion ... after the jump.