Robert Pattinsin has flatly denied he is engaged to Kristen Stewart calling her as "professional partner" who makes his "every move, every sentence authentic."

Pattinson has flatly denied he proposed to Stewart by presenting her with antique jewellery on her 20th birthday as reported.

"This engagement thing is total wrong, I don't even know where it comes from. Kristen is my friend, I really like to work with her," Pattinson said.

"She's more mature than her age, a real professional, I couldn't wish for a better partner, because she makes my every move, every sentence authentic.

"My only weapon for self-defense is to not care about the rumors. I concentrate on my work and on the positive sides of fame," Pattinson said.