I have no doubt that I've heard something she's done, but there's no way that I would be able to identify it or her if she showed up on my tv. I haven't listened to very much radio in probably 10 years now and when I do have it on, it's definitely not those top 40 stations. But yeah, I have heard her name plenty of times.
Oh, and at 29, I'm guessing I'm not really old like b stein suggested.