Naya Rivera's ex-husband Ryan Dorsey paid a touching tribute to the late actress as the US celebrated Mother's Day on Sunday.The former Glee star tragically drowned at the age of 33 last July, with her body being found days after she was reported missing during a boat trip on Lake Piru with her five year old son, Josey. Less than a year after her sad death, Ryan has taken to social media to share an adorable image of Naya and their son Josey to his 167,000 Instagram followers to mark the day.