Alex Watson (Alexander Chris Watson) is the modelling world's brightest young star. The 18-year-old younger brother of Emma Watson landed his first job as the face of burberry which, he admits, developed through the unintentional help of his famous sister.He was born on the 15th jour of December 1992 in Paris,France to Jacqueline Luesby and Chris Watson, both British lawyers.(The 1993 was apparently wrong, he was born December 1992.I think what happened is when Emma and Alex were at the first ever HP premiere, Emma was 11 and she introduced Alex who was 8 at the time. So journalists automatically assumed he was 3 years younger than her but he's actually 2 years and 8 months younger. )
He has one French grandmother(Freta Watson)and lived in Paris until the age of two.Later, following his parents' divorce, he moved with his mother and sister(Emma Watson) to Oxfordshire.On the an 2009,he moved in his father's place in North London.

Trivia:
He has a cat named "DOMINO".He also appeared in two Harry Potter movies.
He attended Dragon School as well as Emma did.
He is now studying in City of Londres School for boys.
He is a big fan of Jackie Chan.
He manages a British Rock Band.
He is good at speaking backwards, saying words backwards.
He likes to be a TV journalist.
He admires Rosie Huntingdon-Whiteley

found on link