I believe it is an adult film star who goes by the names Gia Giancarlo /or Gia Regency. Saw her in the film "18 and Confused". She confronts some cute little chicky that has been fucking her husband and a kinda dark 3-way ends up happening. I also saw her in a series from 40somethingmag.com
http://gallys.40somethingmag.com/pics/185.GiaGiancarlo.23318/?nats=MTIyODg0Mi40LjEwLjEwLjEuMzkzNi4wLjA&page=main.php
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Edited by mods: she is not Gia Giancarlo.