Some babes take time to consider a porn career, but not Britney Stevens. This California brunette dove right into the deep end at the age of 21. However, unlike most pornstars, she wasn't alone. When she got into porn back in 2005, the sexy Pisces did it with her younger sister, Whitney. They didn't end up working together in the same scene until a year later, although they have done at least a half a dozen movies together since then.