It's hard to imagine a billionaire bagging groceries at a local supermarket. But believe it or not, there was a time when top-earners like Warren Buffett or Madonna weren't earning so much. Indeed, many of the world's most famous faces have had a taste of humble pie, doing things like selling plastic duckies and ringing up orders at Dunkin Donuts.

Here are the surprising odd jobs of 15 super-rich people:

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  • Lloyd Blankfein: Concession Seller

    As a teenager, Goldman Sachs CEO Lloyd C. Blankfein <a href="http://www.minyanville.com/businessmarkets/articles/goldman-sachs-blanfein-projects-harvard-ceo/11/18/2009/id/25279" target="_hplink">worked at a concession stand in Yankee stadium. </a>

  • Oprah Winfrey: Grocery Store Clerk

    Oprah Winfrey's <a href="http://www.zimbio.com/Oprah+Winfrey/articles/ooZ9NdKr4DK/Oprah+Winfrey+First+Job+Grocery+Clerk" target="_hplink">first job was as a grocery store</a> clerk.

  • George Soros: Railway Porter And Waiter

    Billionaire investor George Soros <a href="http://www.minyanville.com/trading-and-investing/stocks/articles/stock-gurus-investing-tips-investing-in/7/16/2012/id/42468" target="_hplink">worked as a </a>railway porter and waiter at one time.

  • Michael Bloomberg: Parking Lot Attendant

    Billionaire and New York City <a href="http://uncnews.unc.edu/content/view/4787/107/" target="_hplink">Mayor Michael Bloomberg used to work</a> as a parking lot attendant.

  • Roman Abramovich: Toy Vendor

    Before he became a billionaire, Chelsea football club owner Roman Abramovich <a href="http://www.dailymail.co.uk/news/article-299664/Britains-new-richest-man.html" target="_hplink">used to sell plastic ducks</a> at a market stall.

  • Barack Obama: Baskin Robbins Ice Cream Scooper

    President Barack Obama's <a href="http://www.huffingtonpost.com/2009/12/29/barack-obamas-lessons-lea_n_405987.html" target="_hplink">first job was scooping ice cream</a> at Baskin Robbins.

  • Chris Rock: Red Lobster Busboy

    Comedian Chris Rock was once <a href="http://www.oprah.com/omagazine/Oprah-Interviews-Chris-Rock" target="_hplink">a busboy at the seafood</a> chain Red Lobster.

  • Madonna: Dunkin' Donuts Crew Member

    Once upon a time, singer Madonna <a href="http://www.usmagazine.com/celebrity-news/pictures/stars-fired-from-jobs-2012102/20660" target="_hplink">was a crew member at a Dunkin' Donuts</a> located in New York City's Times Square.

  • Warren Buffett: Grocery Store Worker

    Before he was a billionaire, Warren Buffett used <a href="http://books.google.com/books?id=4oHQR8wqJxAC&pg=PA21&lpg=PA21&dq=warren+buffett+grocery+store&source=bl&ots=xue0v9goFn&sig=H5uRsyAfgpVFYXt0WJ0Kn63ejEU&sa=X&ei=bEklUNztE-nh0QHT24HQDA&ved=0CDYQ6AEwCA#v=onepage&q=warren buffett grocery store&f=false" target="_hplink">to work in his grandfather's grocery</a> store.

  • Jamie Dimon: Greeting Card Seller

    At the age of six, JPMorgan Chase CEO Jamie Dimon <a href="http://www.politico.com/news/stories/0512/76269.html" target="_hplink">started his own business</a> selling greeting cards.

  • Guy Laliberte: Circus Performer

    Before he became <a href="http://www.fastcompany.com/bookclub/excerpts/1591396190.html" target="_hplink">CEO of Cirque du Soleil, Guy Laliberte </a>was an accordion player, stilt walker and fire-eater.

  • Michael Dell: Dish Washer

    When he was 12 years old, Michael Dell, CEO and founder of Dell Computer, <a href="http://www.biography.com/people/michael-dell-9542199" target="_hplink">washed dishes at a Chinese</a> restaurant.

  • Mitt Romney: Chrysler Security Guard

    When he was in high school, presidential candidate Mitt Romney<a href="http://nymag.com/news/politics/encyclopedia/firstjob-2012/" target="_hplink"> held a summer job</a> as a security guard at a Chrysler automobile plant.

  • Li Ka-shing: Factory Worker

    Li Ka-shing, chairman of Hutchison Whampoa Ltd. and Cheung Kong (Holdings) Ltd., was a <a href="http://www.forbes.com/sites/billions/2010/05/10/li-ka-shing-opens-up-about-his-early-years/" target="_hplink">worker at a plastics factory</a> before he became a billionaire.

  • Stephen King: Gas Pumper

    Before he became a best-selling author, <a href="http://www.imdb.com/name/nm0000175/bio" target="_hplink">Stephen King worked at a filling</a> station pumping gas.