Marilyn Monroe

Marilyn Monroe was truly a quite extraordinary women. She excelled in many aspects, but unbeknownst to most people Marilyn was also quite bright. She boasted an IQ over 160, was a successful producer, and a proficient writer. She also held very bright company and could hold her own in their presence. Despite this, she was viewed as a ditz. Marilyn believes this was simply the perception by the pubic, but she didn't do much to oppose this perception. In her profession, she was constantly behind the camera and traditionally played the bubbly role. Overall, it seems likely Marilyn was perceived this way because she played the role the people desired. Men were not interested in her intelligence and saw what they desired. It was also an effort of Marilyn and her entourage to make her appear in the way the audience desired. 

Another celebrity who plays a dumbed down role for the purpose of their image is the rapper 2 Chainz. 2 Chainz raps on a very slow rhyme scheme and employs lyrics which are very basic. They are often funny due to their simplicity and ridiculousness. 2 Chainz is a "bitches and hoes" rapper and does not portray himself as being the most clever, but in reality, he is quite intelligent. It was one time rumored that 2 Chainz was a student athlete, 4.0 student, and graduated in 3 years. However, only some of this is true. 2 Chainz was a student athlete, and did attend college, but did not graduate in 3 years or maintain a 4.0 GPA. Furthermore, 2 Chains made a splash when he schooled Nancy Grace in a debate over legalizing marijuana on her TV show. Similar to Marilyn, 2 Chainz dumbs down his lyrics in an effort to produce music people desire. Most fans of the genre 2 Chains is involved in desire simple music with catchy lyrics. They are not looking for overcomplicated intellectual lyrics. In many ways, Marilyn and 2 Chainz are similar. 

via https://www.quora.com/Did-2-Chainz-really-graduate-college-with-a-4-0-GPA