Social media endorsement fees: At 2nd spot, Kendall Jenner paid $300,000 per tweet, but who is number one?

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If you think that models and singers hit Instagram in their free time to simply upload duck face photos, think again. This is all part of a shrewd business move to hike up their endorsement fees. In fact, many brands pay celebrities staggering amounts to feature their products on their social media accounts. Naturally, the more followers a celeb has, the higher the fee they can charge. Check out the social media fees that celebrities Kylie Jenner, Cara Delevigne, Gigi Hadid, Kim Kardashian charge – we guarantee it will make your head spin. (Twitter)

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Number 6: The youngest member of the Kardashian clan comes at the end of this list, but is by no means poor by our mere mortal standards. Kylie Jenner commands roughly $100,000-300,000 per post, according to a report in Daily Mail. Jenner's popularity comes from partial nudity, varying hairstyles and hair colour and cool-by-association posts via big sisters Kendall, Kim and their famous friends. (Twitter)

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Number 5: Cara Delevigne's fame from her modeling days and now her movies (Suicide Squad, Paper Planes) allows her to rake in roughly $150,000 per post. As a former model, a majority of Cara's earnings came from endorsing luxury brands on her account. (Instagram)

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Number 4: Kim Kardashian may be the social media queen, but she can't translate that fame entirely into cash. According to a report in the Toronto Sun, the reality TV star takes around $200,000 per post. However, when coupled with her rapper husband Kanye West, the pair can bargain for around $400,000. (Instagram)

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Number 3: Not only was Gigi Hadid the fifth highest paid model last year, but her Instagram popularity earned her deals of around $300,000 per post. (Twitter)

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Number 2: The highest earning member of the Kardashian clan, Kendall Jenner earns around $125,000-300,000 per post – although the exact amount could go higher. Thanks to her tremendous Instagram earnings, she beat bestie Gigi to take the third spot in last year's highest paid models list. (Twitter)

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Number 1: Selena Gomez is a head above the crowd with a record of $550,000 per post. With the highest amount of social media followers, Selena leaves all the models before her and singers like Rihanna, Beyonce and Taylor Swift in the dust. (Twitter)