Held at the Odeon Leicester Square in London, England, both ladies looked elegant as Miss Allen showed off her baby bump while Miss Arterton dazzled in white.
Both doing their fair share of interviews as press efforts push forth, Lily talked with Daily Record about the nerve-racking early months of pregnancy as she carries boyfriend Sam Cooper's baby.
She said, "I came off the pill and, weirdly, a week later it happened. But then it was really difficult ? I had complications. I had about a week and a half of really heavy bleeding and had to have lots of scans. I've been living in fear for the past three months."
Meanwhile, Gemma dished on how she'd love to play "Wuthering Heights" singer Kate Bush if she were to make a musical biopic film.
Chatting with ITN, she said, "Kate Bush, maybe, in the future. There are a few people [I'd like to play], but they're still living. I just think it's weird playing someone who's still alive. If they're rock stars they can be quite scary, people like Courtney Love. I love Kate Bush and I reckon I could do a good Kate Bush impression but she's still alive - good!"
Denise Richards Natalie Zea Kristin Kreuk Leslie Bibb Piper Perabo Vanessa Simmons Lokelani McMichael Carol Grow Jessica Cauffiel Nadine Velazquez