Kelly Rowland and Nelly dated because if you go to youtube and that song (gone) you would have your answer
a girl named Serina
As far as I know, he's dated Kirsten Dunst (2 years off and on) and Jenny Lewis. Before Kirsten, there were rumors that Jake and his good friend Natalie Portman were dating a little, but that was never confirmed.
Currently he is supposedly dating "Rendition" co-star, Reese Witherspoon, but that is also not confirmed. There has only been one set of pictures taken of them together, and that was in Reese's car, back on July 31st. Before that, and after that, there have been no pictures.
She doesn't have one