Is this a breach of Contracts?

A contact is an agreement of exchange of promises under mutual benefits between two or more individuals parties, business or corporations or governments that is legally binding and enforceable by law.

Paris Hilton Testifies in Breach of Contract Case

BY: Actress Archives | Friday, July 10, 2009

Paris Hilton headed to federal court today in Miami to defend herself in the breach of contract case against her. Hilton is being sued by movie investors who claim that Hilton failed to do enough to promote her 2006 film "Pledge This." Investors are suing Hilton for over $8 million. They claim that Hilton signed a contract saying she'd promote the film and its DVD release. Then, Hilton reportedly refused to do interviews or do other promotional duties.

Paris Hilton on the other hand, says that she constantly plugged the film and met the requirements of the contract. She says that the producers of the film made unreasonable demands of her, considering her full schedule.
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In my opinion, Paris failing to do interviews and other promotional duties does not clearly define her contract with the investors, this contact is missing an important element of a contract which is certainty; it is uncertain as to whether she has to do the interviews and other promotional duties as part of the contract apart form the stated contract. Since this remains uncertain, there is every possibilities of a breach of contract not only from her but also, it could come from the investors especially when they are demanding more from the contact leading to unqualified acceptance of the contract.