Someone who avoids failure on the basis of attractiveness rather than his/her merits. It applies to presentations, oral exams, job interviews where the individual is under-qualified, under-prepared or under-smart but still receives a favourable evaluation because of the individual's appearance.
Heidi: Can you believe Brooke passed her oral after her three day bender in Vegas? I'm surprised she could even form a coherent sentence.
Marisa: She didn't have to. She's too hot to fail.
It may be extended further,
Nancy: Megan Fox is shallow and a terrible actress.
Billy: Ya but I bet her movie does well. She's too hot to fail.