Beyoncé: April 2009, with "Halo". God, I remember seeing "If I Were a Boy" on TV in winter 2008/09, but I used to skip it.

Lady Gaga: February 2009, with "Poker Face".

Stop it with the same old tired threads. Don't you have anything more important to do???

Britney since like 2004. Gaga since 2008, can't exactly remember the rest