is this a jay z song?

[dollbaby]

i herd a song and i think jay z was rapping in it? and the chorus was a high pitch womans voice, i can only remember a few words which i think were "always be my sunshine"
its not alot of information but i need to know the name of the song and if i can buy it??

[capper1985]

the lastest jay-z track is de ja vu' with beyonce...

it's in the chart now