Who is it? #12 - Question #4 - completed!

I will be posting five pictures, but not at the same time. It's up to you to figure out which person I'm looking for. There is a connection between the persons/things on the five pictures and the person I'm looking  for. This is the fourth picture.

Please read the rules. Write your answer under Comments. Good luck!

Updated!
And we have a winner! Congratulations Niklas! The right answer was of course Lady Gaga.

Question #1: Lady Gaga credits her stagename to the song Radio Ga Ga by Queen.



Question #2: Lady Gaga is famous for her outfits, for example her bubble costume.

Question #3: Her song "Poker face" attained worldwide success.



Question #4: She has worn clothes and shoes designed by Alexander McQueen many times.