Some pics of REG outside the ITV Studios in London on Friday 17th January 2014.

Zosia Mamet, Lena Dunham, Allison Williams and Richard E Grant
attend the UK premiere of Girls season three in London.
Photograph: Anthony Harvey/Getty Images

The UK Premiere of season three of “Girls” took place at the Cineworld Haymarket in London. Lena Dunham, who looked glamorous in a monochrome 50s-style floral dress by Erdem, was joined at the screening by co-stars Allison Williams, who plays her screen best friend Marnie Michaels, and Zosia Mamet (Shoshanna Shapiro) as well as long-time fan Richard E Grant, who guest stars in the coming series.

“I have a 25-year-old daughter who obsessively watches the show,” said Grant. “All the things she’s going through are the things the characters are going through so it’s a real window into the world of the young, who have left home and finished college or university and trying to make their way into the world – and the sexual politics are eye-opening, to say the least.”

Grant admitted he was not allowed to divulge details about his character, except that he has “a relationship with one of these younger ladies”, and hopes to reprise the role in the future.

“They all really get on with one another so it felt like going to someone’s house except it’s work. And Lena is a very unassuming boss – she is astonishing. She has such authority but does it effortlessly without being diva-ish,” he said.

The third series of Girls will premiere on Sky Atlantic on 20 January.

Richard appeared with Lena Dunham on the cover the cover of The Sunday Times magazine, promoting the upcoming third season of HBO’s “Girls”.

“Absolutely thrilled to make the cover with Lena Dunham -THE multi-hyphenate talented actor-writer-director-producer” Tweeted REG on his Twitter account.

In the show, REG makes a big impression as Jessa’s friend Jasper. Executive producer Jennifer Konner said Richard was “A really big fan of Girls”, before adding “Withnail and I is one of our favourites. That was living the dream.”