Nina Dobrev and Ian Somerhalder joined fellow celebs like Rachel Zoe last night in West Hollywood to celebrate Glamour's upcoming book 30 Things Every Woman Should Have and Should Know by the Time She's 30. The new title, which will hit stores on April 24, features advice from notable women including Rachel, Maya Angelou, Lauren Conrad, and Katie Couric on love, work, and living well. Rachel, who was wearing a dress from her new Spring line to the event, contributed an essay on knowing whether or not she wanted to have children to the collection. She made the party rounds with her friend and makeup artist Joey Maalouf and celebrity hairstylist Byron Williams. Nina and Ian also made an appearance late in the evening after a busy weekend spent at Coachella. We spotted the pair at the Burton pool party, and they also caught plenty of bands during their time in the desert. While the couple didn't pose for pictures together, Ian did stop for a few snaps with Glamour editor-in-chief Cindi Leive. Ian is a familiar face in the pages of her magazine — he modeled for the April issue in a sexy spread and gave an interview revealing his romantic side inside.