Which Nickname does not belong to a Top 20 Hit Singer?

Question: Which of these nicknames used by the press and media is not for a singer who has had a solo Top 20 hit single in the official UK chart? Is it Xtina, R Patz, J.Lo or SuBo?

Answer: The person who hasn’t had a Top 20 hit is Robert Patterson aka R Patz, an actor who is the star of the Twilight series of films.