Hollywood siren Jessica Alba has fuelled speculation that her relationship with boyfriend Cash Warren is in 'royal' trouble by revealing that she has a crush on Prince William.

The 26-year-old actress, who shot to fame after her film "Sin City" became a runaway hit, said she was still searching for a perfect father for her future children, contactmusic.com website reported.

Alba, who has been dating Warren from January 2005, said: "I always felt I had been born into the wrong family. I felt I should have been a royal."

Jessica Alba also expressed her confusion that she could't understand why actresses choose to have plastic surgery.

Alba has vowed that she will never go under the knife because she wants to age gracefully and retain the expressive nature of her face for acting roles.

"As an actress, you express emotion with your face. And if you have plastic surgery, you lose that spark," Alba explained. "People usually look better without surgery - my grandmother aged very gracefully."