Rhona Mitra’s nephew thinks she is “the greatest thing ever” since she landed the role of a vampire.

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The 31-year-old Doomsday actress has landed the lead female role of Sonja in Underworld 3: The Rise of the Lycans.

Rhona revealed at least one member of her family was thrilled that she is set to star in the movie.

The British star said: “I have a four-year-old nephew who is probably going to think I’m the greatest thing ever now. I’m getting to wear armour and have fangs.”

Kate Beckinsale played blood-sucking warrior Selene in the first two movies, but quit the franchise to take on more challenging parts.

Kate’s husband, Len Wiseman, who directed the first two instalments, is producing the latest movie – a prequel to the original 2003 movie.

Both Bill Nighy and Michael Sheen are to reprise their roles as king of the vampires Victor and lycanthrope Lucian respectively.

Kate, who has a daughter Lily with ex-boyfriend Michael, met Len on the set of the first movie.

Rhona plays Sonja, daughter of Bill’s character Viktor and secret lover of Lucian, played by Michael.