Taking a trip outside of their comfort zones, these celebrities have ventured the world of business - opening their mind to more opportunies and discovering other things that they are actually good at, apart from entertaining people from afar. Meet 5 of the most successful celebrities slash entrepreneurs, Who knows? Your favorite might just be on this list, ready to inspire you.

Gwen Stefani. Named after her 2005 solo album called Love Angel Music Baby, Stefani has launched a high-end clothing line for women called L.A.M.B., which is Asian-inspired and has expanded its collection with fragrances, bags, jewelry and shoes. Estimated to bring $100 million in annual sales, the former No Doubt leading lady's L.A.M.B. is a favorite among her fellow celebrities.

Clint Eastwood. Engaging himself in politics by successfully running for mayor, owning a hotel in Carmel, California, having his own production company called Malpaso Productions and two 18-hole golf courses, the Academy Award winning actor truly deserves being on the list of Forbe's most powerful celebrities.

Robert de Niro. From the US down to the Republic of the Philippines, to Hong Kong, Cape Town and a lot more, De Niro's upscale sushi restaurant called Nobu is something you just can't ignore. He co-owns two food franchises and is also a part owner of an Italian cafè Ago. 

Dr. Dre. Apart from creating these headphones that you can always see being worn by your favorite athletes and musicians called Beats by Dre, he also co-founded the record label Aftermath with his friend rapper Eminem. The sales of Beats have been skyrocketing edition per edition, earning Dr. Dre the number one spot for the richest celebrities according to My First Class Life's list.

Ashton Kutcher. Also known as Kelso in "That 70's Show", Kutcher has invested his money while making our lives become more efficient by helping the launching of Uber.