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Gwyneth Paltrow

It's no surprise that Gwyneth was advocating for a good cause back then, since she's seemingly so perfect today. The "Iron Man" star continues to act, even picking up an Oscar for 1998's "Shakespeare in Love" and singing in some roles as she did on "Glee;" runs her own lifestyle website, Goop; and even published her own cookbook called My Father's Daughter. Whew!

Stars Take the Plunge

Celebs from Gwyneth Paltrow to Demi Lovato sport cleavage thanks to the revealing neckline trend.