"#Reflections of such a beautiful wedding," the 26-year-old musician wrote. "Me and my amazing wife @ashleesimpsonross. At my mothers house in Greenwich Connecticut! And now I can't wait to meet my little baby girl."
Ross and Simpson, 29, were married in Aug. 2014. Simpson's sister Jessica served as maid of honor and friend CaCee Cobb was a bridesmaid. According to a rep, it rained 30 minutes before the event, and a rainbow appeared as guests arrived.
Immediately following Ross and Simpson's wedding, Diana Ross shared with ET all the emotions she was feeling as the mother of the groom.
"Loving family and friends, great music, great speeches from caring friends and joyful children dancing the night away," she said. "Wishing Evan and Ashlee congratulations. I want only love, happiness, joy for my son and his bride."