Mercedes / YouTube
But she's only on-screen for a few brief moments, about 5 seconds in all.
Of course, Mercedes did have "her washing" a Merc CLA in shorts for a teaser ad.
The real star of the ad is actor Willem Defoe, who plays Satan attempting to persuade a man in a bar to sell his soul for the car. We won't spoil the ending. The music for the ad is The Rolling Stones' "Sympathy for the Devil."