I said It and I'll say it again.
GaGa has HUGE airplay and HUGE sales.
She won't give up #1 for now.
CeeLo's airplay is gaining over 2.5M daily, and he's not very far from GaGa. So right now he's the only competition Gaga has.
But his sales are dropping even though he has 16852565585 versions of the song on itunes, so if he doesn't snatch that #1 in two weeks, the only one that would be able to take it is Britney herself.
I don't see Rihanna OR JLo taking the #1.
JLo's airplay should have started increasing at least at a decent pace right now, and it hasn't. And Rihanna has big airplay and big sales but GaGa owns her in BOTH.
Conclusion: GaGa will stay at #1 for 2 or 3 more weeks!