Avril Lavigne raised eyebrows on Sunday when she attended the Juno Awards in Canada with her estranged husband, Nickelback frontman Chad Kroeger. In addition to looking cozy on the red carpet, the singer also posted a cute picture of them on Instagram, writing, "Boots on the ground in Calgary 🇨🇦 Juno Awards @nickelback." The couple announced their split last September, but that hasn't stopped them from reuniting from time to time. Aside from making a casual outing in LA together over the holidays, the two looked pretty happy when they stepped out at a Grammys party together in February. See more pictures from their latest appearance here, and then check out even more celebrities who are friendly with their exes.