AceShowbiz - Eighties pop singer Debbie Gibson has warned Justin Bieber to slow down on his rise to superstardom, because he will "lose his sanity" if he fails to stay grounded. Gibson became a teen sensation after the release of her single "Shake Your Love" in the 1980s and she credits her mother's guidance with helping her to avoid the pitfalls of fame.

But she worries Bieber, 16, is taking on "too much too soon" - and fears his hectic schedule will cause him to crash and burn when he's older. She tells Eonline.com, "People have to remember even though a kid can be wise beyond their years professionally and can handle showbiz, emotionally you're not developed. Somebody has got to remember that Justin is 16. (If he doesn't stay grounded, he will) lose his sanity (later)."