We might think that as celebrities, they are already satisfied with the way they earn money. What we don't know is that some of our favourite personalities are also into the business world. Here are 10 of them:

1.       Jackie Chan

The Hong Kong martial artist best known for "Rush Hour" and "Jackie Chan Adventures" surprisingly never completed his education which hurt his reading and writing ability. Despite of it, Chan continued on striving to land major roles and has also launched and co-founded several businesses. He has his very own film and distribution company and as well as three other production companies. Jackie Chan Theater International is dubbed as some of the biggest theaters in China. He also has his own line of clothing, several restaurants and signature gyms.

2.       Ashton Kutcher

Kutcher is an avid entrepreneur with deep interests in internet start-ups. He founded Katalyst Mediawith a friend Jason Goldberg which was behind "Punk'd" and other shows and movies. Blah Girls, an animated web series, was Kutcher's first venture into online entrepreneurship.

3.       Phil Mickelson

Tiger Woods' nemesis one of the five guys who purchased investor rights of the burger joint "Five Guys". Although the Five Guys is only available in certain states like Virginia, East Coasters live by them.

4.       Justin Timberlake

Timberlake has investments in an application development company called Miso Media and the online photo labelling tool Stipple. Tennman Records is also Timberlake's own record label.

5.       Sandra Bullock

In Texas, Bullock owns Bess Bistro, a restaurant in Austin. She also founded Walton's Fancy and Staple, a bakery and florist shop which also manages event planning. She is also an executive producer for the George Lopez Show.

6.       Venus Williams

One of the world's best tennis players has her own clothing line called "EleVen" and runs interior design firm in Florida "V Starr Designers".

7.       Will Ferrell

Ferrell founded most people's favourite website: Funny or Die.

8.       Ludacris

Rapper and actor has teamed up with restaurateur Chris Yeo for plans of venturing into the culinary world and open one of several restaurants across Atlanta.

9.       Kanye West

Kim Kardashian's hubby has designed for various brands like Nike and Louis Vuitton and now has his own line called Yeezy.

10.   Lady Gaga

Lady Gaga is involved in various ventures. She has her own line of perfume, an exclusive deal with MAC cosmetics and even her own comic book series.