Robert Pattinson and Kristen Stewart are so “deeply” in love, the young couple is playing up their romance on the Vancouver, Canada, set of the third Twilight film, Eclipse.

Insiders say Rob and Kristen — who are yet to officially confirm they’re dating — refer to each other as ‘husband’ and ‘wife’.

“If Kristen is looking for Rob, she’ll say, ‘Has anyone seen my husband?’” a source told America’s OK! magazine.

“And Rob loves to say, ‘Have you met my lovely wife, Kristen?’ It’s cute. They’re like a couple of love-struck teenagers.”

“There are those subtle pats and glances on set, but they save the real kisses for after the sun goes down, late at night, when you see them disappear into their hotel,” the source added.

The insider also revealed that Twilight’s producers have told Robsten to keep their romance low-key.

“Studio bosses fear that if a romance between Rob and Kristen is confirmed, Twilight fans won’t buy into the screen chemistry between Taylor Lautner and Kris.”

Sources recently revealed that the “sexual spark” might “explode” when Kristen and Rob start filming Eclipse. - showbizspy reports.

Robstenation take: The "husband and wife" part is cute, I must admit. Again, some saltines everyone.