Pretty Passenger gets to sit in cockpit due to overbooked flight

This topic is quite unusual and I do hope that other airlines are not like this. Apparently a Chinese Airline allowed a "pretty passenger" (who is seemingly also an airline staff's relative) to sit in their cockpit because the flight was overbooked, but in my opinion this shouldn't be allowed, no matter who or how pretty you are. 
If you look at this video you can see that she even recorded the landing of the flight, pretty cheeky if you ask me. By allowing this kind of act, the airline put the lives of all other passengers in danger, because whether pretty or not anyone who is not entitled to be in the cockpit is a risk. Anything can happen, so this was really careless of the pilot, staff, the airline and whoever allowed it. So what if the flight is overbooked, then she should take the next flight just like anyone else. I'm sure that flight wasn't the last one going to wherever her destination was. What do you think of this issue?

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