They could easily feature songs like Diamonds and Only Girl in this movie. Like I said earlier Dreamworks isn't very "Rated-PG". They've had songs title "Gold Digger" in their past soundtracks.
An album of "Umbrella", "We Found Love", "SOS", "Stay", etc (basically Rihanna tracks acceptable for a younger audience) wouldn't be so bad, though. Rihanna can have quality material without explicit lyrics.
I'll still watch though. 
