Celebrity endorsements are one of the oldest marketing tricks in the book. Take, for instance, Jessica Szohr of Gossip Girl fame. The actress was spotted checking out fragrances like DKNY's DKNY Be Delicious Fresh Blossom EDP Spray ($55 to $70) and Island Michael Kors Bermuda EDP Spray ($62) in these totally candid and not-at-all-staged photos.

So whether it's an age-old celebrity endorsement or product of their own, like Jessica Simpson's cult-favorite Fancy, does any of that make an impact on your purchasing decisions? Let me know below, and then have some pure, unadulterated fun by testing what you know about star endorsements in parts one and two of my celebrity infomercial quizzes.