Kaley Cuoco as Billie Jenkins

Kaley Christine Cuoco, born November 30, 1985) is an American film and television actress. She is best known for her roles as Bridget Hennessy on the sitcom 8 Simple Rules, Billie Jenkins on the supernatural drama Charmed and Penny on the sitcom The Big Bang Theory.

http://en.wikipedia.org/wiki/Kaley_Cuoco

Billie Jenkins, for most of Charmed's final season, Billie was a young apprentice witch to the Charmed Ones, and the charge of the youngest sister, half-Whitelighter Paige Matthews. She was also concerned about finding her long-lost sister, Christy Jenkins--not knowing that she'd been turned evil by the demons that kidnapped her 15 years earlier. She is known as the 'ultimate power' in demonic circles because, along with her sister Christy's pyrokinesis, her projection power enables her to time-travel, and vanquish demons long thought unvanquishable even by the Charmed Ones, in no small part because she can also amplify the powers of others.

http://en.wikipedia.org/wiki/Billie_Jenkins

I love Billie... she brought this cool young feeling in the show..
where ever she was => action ..

she's hot, xD.