Ivana Milicevic plays a sassy mistress in the August 20th [penultimate 1st season] ep of the USA Network series
Royal Pains titled "Nobody's Perfect." Her character could also be described as a Maggie-Evans-turned-gold-digger type.
You can access the full episode
here, or check the
network schedule for repeats. (Or watch it on USA on September 3 at 2 p.m. Eastern & Pacific times.)