Washington, Feb 3 : When it comes to style, actor Zac Efron and his High School Musical sweetheart Vanessa Hudgens are completely opposite, according to top interior designer Kenneth Brown.

Brown, who has taken over the task of the couple's homes, fears that their romance will be doomed if they ever move in together.

"They''re completely opposite... If they ever get married, they''ll have to have separate houses. He''s very modern and she''s very traditional," Contactmusic quoted Brown telling the Chicago Tribune.

Efron and Hudgens have been dating since the filming of High School Musical.

They have even topped FoxNews. com''s list of Favourite Couples of 2008. (ANI)