The 40-year-old actress and 50-year-old singer brought the 6-month-old to the Amazon Video Tumble Leaf Family Fun Day. The couple was also accompanied by Gilbert's 10-year-old son Levi and 8-year-old daughter Sawyer.
Au Fudge co-founder Estee Stanley hosted the event, which featured an elaborate photo booth and kid-friendly foods, including grilled cheese sandwiches and french toast sticks. Tumble Leaf premiered on Amazon Video in 2014.
Gilbert and Perry have been together since 2011, and married in March 2014. The actress gave birth to Rhodes in February, and the couple recently announced they will release the children's album Deer Sounds on Sept. 18.
"These songs just started to show up when [Rhodes] was born and then it just got really exciting because we were all in the house and all a part of it, all throwing in ideas and making artwork," Gilbert told People magazine last week.
Gilbert is best known for playing Darlene Conner-Healy on ABC sitcom Roseanne, and currently hosts and executive produces CBS talk show The Talk. Perry came to fame as the lead singer of 4 Non Blondes, and last released 8 Songs About a Girl with Deep Dark Robot in 2011.