But they couldn't hide their feelings for each other as they got together with the Twilight cast at Comic Con International 2012 last night. Naw.
Hanging with the rest of their Breaking Dawn co-star Taylor Lautner, Nikki Reed, Ashley Greene and Mackenzie Foy (who plays Renesmee), RPattz and KStew made the cutest of couples as they posed for photographers.
Kristen Stewart showed off her svelte figure in a yellow mini skirt, cropped white tee and trademark black hi-top trainers.
Looking more relaxed than ever before, the 22-year-old smiled and laughed as she hung out with her cast mates at the San Diego Convention Centre.
And it was clear to see just how much Robert Pattinson adores her as he barely left her side during the session.
Rob, who looked relaxed in black jeans, a black t-shirt and grey shirt, had his arm around his girlfriend whenever he could.
And with Kristen stealing the show in her sexy sporty togs, we caught Rob stealing sneaky looks at his girl.
The pair were liked giggling teenagers during the press conference, laughing into their hands as they answered questions.
Meanwhile co-star Taylor Lautner joined the happy pair, looking HOT in an open blue shirt which showed off just the right amount of chest hair *swoons*.
And the Twilight girls made sure they were keeping up with Kristen's sexy look. Nikki Reed opted for a black skin-tight leather skirt with a breton tee and strappy sandals.
Ashley Greene showed off her drop-dead-gorgeous figure in a white knee-length sleeveless dress and tan accessories.