I Wanna Go becomes Britney's 6th #1 Hot ARC!!
Other #1s:
Womanizer #1 for 2 weeks - retired after 22 weeks.
ARC Chart Run: 29 - 20 - 12 - 7 - 6 - 6 - 6 - 6 - 5 - 4 - 2 - 2 -
1 - 1 - 4 - 5 - 7 - 9 - 12 - 15 - 19 - 28 - off
Baby One More Time #1 for 3 weeks - retired after 24 weeks.
ARC Chart Run: 37 - 30 - 25 - 19 - 14 - 11 - 9 - 8 - 7 - 7 - 5 - 4 - 3 -
1 - 1 - 1 - 2 - 6 - 12 - 17 - 19 - 24 - 32 - 35 - off
Toxic #1 for 1 week - retired after 22 weeks.
ARC Chart Run: 40 - 34 - 24 - 16 - 6 - 4 - 4 - 3 - 3 - 2 -
1 - 2 - 4 - 4- 4 - 4 - 9 - 12 - 14 - 17 - 24 - 37 - off
Oops! I Did It Again #1 for 5 weeks - retired after 17 weeks.
ARC Chart Run: 38 - 27 - 16 - 9 - 5 - 3 -
1 - 1 - 1 - 1 - 1 - 3 - 9 - 14 - 20 - 28 - 33 - off
Crazy #1 for 1 week - retired after 18 weeks.
ARC Chart Run: 40 - 28 - 19 - 15 - 13 - 5 - 5 - 3 - 3 - 3 - 2 -
1 - 3 - 7 - 11 - 19 - 26 - 37 - off
I Wanna Go #1 for 1 week SO FAR
ARC Chart Run: 36 - 28 - 14 - 13 - 10 - 9 - 9 - 5 - 3 - 2 - 2 -
1 -
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Till The World Ends & Hold It Against Me both peaked at #3, although TTWE retired after 20 weeks, when HIAM retired after only 14 weeks.
We don't even get one brand new song that was an outtake from the Femme Fatale recording sessions. 
...our favorite number!
