Robert Pattinson, Kristen Stewart On, Or Off in London? (photos) 1Robert Pattinson and Kristen Stewart seemed as dreary as the London weather during Rob’s week-long visit to the city, where Kristen is filming her latest movie. Whether they spent quality time together is open to question.

Rob was spotted back in Los Angeles today (Sept. 15) arriving at the airport, looking pre-occupied and heavily jet lagged.

He was dressed down in jeans and a tee-shirt and unshaven. An assistant helped him with his luggage, toting his guitar while he dragged his wheeled luggage behind him.

Rob and Kristen must be feeling some separation anxiety since the end of filming on the last of the “Twilight” movies, “Breaking Dawn,” Part I and Part II.

Some domestic reports said Rob was spotted walking around Notting Hill by himself during a late night out, and some blogs wondered why Rob and Kristen were not seen out together.

But the British tabloids were reporting a different story.

Rob and Kristen were spotted together on a sightseeing tour of the capital just before Rob headed back to Los Angeles, British tabs claimed.

Surprisingly, however, no photos have surfaced of them together, and British tabs are often known to concoct stories.

Rob, however, was seen and photographed leaving a pub with a blonde companion, said to be his British agent, before meeting Kristen, according to London’s Daily Mail.

Kristen appeared sullen in a grey hooded top, white Adidas T-shirt and tight dark denim jeans.

Rob wore a Baltimore Orioles baseball cap with a Stussy jacket, blue shirt and white v-neck T-shirt and dark jeans.

It’s the same outfit he was wearing when he arrived back in L.A. and looked like he’d slept in it on the plane.

The couple reportedly spent their day on a tour of the capital’s landmarks, the London tabloid reported.

Rob and Kristen also reportedly went on a double date with friend Tom Sturridge who is dating British actress Sienna Miller.

After dinner, the group head for the members-only Groucho Club, for late-night drinks.

Everyone “looked happy” and seemed to be enjoying one another’s company, one source said.

Kristen stayed behind in London where she is filming scenes for her latest movie, “Snow White And The Huntsman.”

The movie also stars Chris Hemworth, Charlize Theron, Ray Winstone and Ian McShane.