Penn Badgley & Co-Star Charlotte Ritchie Get to Work on 'You' Season 4 in London

Penn Badgley is hard at work on the set of You season 4.

The 35-year-old actor was spotted filming with co-star Charlotte Ritchie on Monday (July 11) in London, England.

The pair were seen walking arm-in-arm through the Primrose Hill neighborhood for their scenes.

Penn wore a black polo shirt and tan pants, while Charlotte, opted for a bright green tank top, jeans and black flats.

The Gossip Girl alum has been spotted working on the show quite a bit over the past few weeks. He was seen chatting with the crew last week and was also spotted on set late last month.

Back in March, he was seen filming a night scene with two of his new co-stars.

Click through the gallery for the latest photos of Penn Badgley on the set of You in London…