Couple Robert Pattinson and Kristen Stewart still own the top buzz. News sources are reporting that the stars of the upcoming film 'Twilight Saga: Eclipse' enjoyed a romantic date in a London pub. How romantic? Sources of news sites spilled that R-Pattz and K-Stew enjoyed a night out with Rob's sister Lizzy in Putney district, south west of the City of London, U.K.

Robert Pattinson and Kristen Stewart at the Paris, France screening of 

'Twilight Saga: New Moon' last year. Photo by: Fame Pictures

"They were very low-key," a source told the Sun. "You would not have guessed they were one of the most famous couples in the world," the source added. Unlike Brad Pitt and Angelina Jolie - who love to dine in a glamorous and popular restaurants and bars - Rob and Kristen's recent sightings prove that the couple are not into glamorous partying and eating.

Another Rob and Kristen sighting - UK's Marie Claire is reporting: "On Tuesday lovely Kristen attended the Burberry Prorsum show at London Fashion Week, but arranged to meet R-Patz for a quiet drink afterwards."