Nina Dobrev and Joe Jonas took the stage together in Toronto for WE Day yesterday. The annual gathering brings together student leaders who are working for a range of social causes. Nina frequently lends her celebrity to charitable efforts. She's also the spokesperson for Puma's Project Pink, which raises funds for breast-cancer research, and has also been active in environmental and animal-protection causes. Nina took time out for the trip North this week as her hit CW series, The Vampire Diaries, enjoys the start of its season. Earlier this week Nina actually injured herself on set, but she didn't let her concussion get in the way of her philanthropy. The show is two episodes into its third year, and while the drama between Nina and Ian Somerhalder's characters continues, the couple seems to be going strong when the cameras aren't rolling. Nina and Ian were at the Emmys together, hand in hand, and the pair even took their mothers on a getaway to Paris during their Summer hiatus from work.