All the songs in that set of workouts (X10, Party Rockin' Step, etc.) are what I call "Franken-songs", meaning they're close copies of popular pop songs but they've changed the lyrics and instrumental portions just enough to avoid paying premium fees for use of the true song. So, I don't think you'd actually find the exact song as it's played in the workout, unless you somehow found the music producer that creates those "Franken-songs".
The Franken-songs also make it difficult at times to identify what the original song was supposed to be.
I don't have X10, so I can't for sure get a long enough listen to the tracks in the Step portion of the workout just from watching the preview clip. Some of the music in the workout sounds like rips from Katy Perry, but I could be wrong.
Hopefully someone with a more attuned ear can help you identify the actual real song the music is based off of.