She rose to prominence as the lead actress in the James Cameron television series Dark Angel (2000–02) when she was 19 years old.
Ryan, 42 has been heavily linked to Katy in recent weeks, however the actor has finally taken to Twitter to insist that he is not dating Katy.
Her mother has Danish, Welsh, German, English, and French ancestry, while her paternal grandparents, who were born in California, were both the children of Mexican immigrants.
Alba has described her family as being a "very conservative family – a traditional, Catholic, Latin American family" and herself as very liberal; she says she had identified herself as a "feminist" as early as age five.
Taking it one step further, Ryan, 42, added that he's hardly ever spoken to the singer in his life.
Ryan – who was married to Reese Witherspoon from 1999 until 2007 – wrote: "I am not dating Katy Perry.