This site came into existance when? 1999, right? You can't just go back and create charts for the past. Im sure their calculations are correct, using official charts from every country and whatnot, but creating past charts makes no sense and makes this site even more invalid than it already was.
CHRISTINA AGUILERA: [15 WITH COLLABORATIONS, 13 AS A LEAD ARTIST]
Genie In A Bottle (1999)
What A Girl Wants (2000)
I Turn To You (2000)
Come On Over (All I Want Is You) [2000]
Nobody Wants To Be Lonely (with Ricky Martin) [2001]
Lady Marmalade (feat. Lil' Kim, Mya & Pink) [2001]
Dirrty (feat. Redman) [2002]
Beautiful (2003)
Fighter (2003)
Can't Hold Us Down (feat. Lil' Kim) [2003]
The Voice Within (2004)
Car Wash (feat. Missy Elliott) [2004]
Ain't No Other Man (2006)
Hurt (2006)
Moves Like Jagger (with Maroon 5) [2011]
Janet has at least 22 top 10 hits, minus at least 3 from 1986, which I can't find chart stats for. (Sorry, meant for Duca to try and put her up there!)