Hilary Duff, Lindsay Lohan, Ashlee Simpson, heck even Lalaine (who never released a second album, but it was supposed to be pop-rock. & now she's heading to the dance genre)
Basically most of these young ladies try a stab at pop/rock, darker pop/rock & then dance... If not that formula, they may start off in a different genre, but eventually at their third or fourth release go to dance. It's funny, I've seen this happen with more artists as well. I bet Vanessa will go to dance as her favorite genre with her next album as well.
And actually, I've heard this next album will be a lot more pop/rock/country than her last one.