In reply to Melody.

'Gimme More' and 'Break the Ice' by Britney Spears
'The Way I Are' by Timbaland
and obviously 'Knock You Down' by none other than misskeribaby
and she's written many more:
'Runaway Love' Ludacris
'Wait A Minute' Pussycat Dolls
'Like A Boy' by Ciara
'Young Love' by Chris Brown
'Ice Box' by Omarion
'Take me as I am' and 'Stronger' by Mary J Blige
and many many more...