She was actually 17 when Drake first texted her. Not that it really matters, as Gim pointed out. I've heard people claim that middle aged men are "pedophiles" if they're attracted 20-something women, since they're "old enough to be her father!", don't you know.

She was also 17 when she recorded the song for the new James Bond film - youtube.com/watch?v=GB_S2qFh5lU - but the press release is careful to say that she is the "youngest ever" at 18.