The musician announced the union Sunday on Twitter with a photo of the two brides walking down the aisle.
True love...so blessed. "By the power invested in me by the state of California..." Thanks pic.twitter.com/rWftMxdxQv— Melissa Etheridge (@metheridge) June 1, 2014
The couple married at the San Ysidro Ranch at the foot of the Santa Ynez Mount range with all four of Etheridge's children participating.
"They were so happy," one guest said. "It was really beautiful."
As part of the ceremony, Etheridge sang a song she wrote for Wallem and had never performed previously.
"It was such a magical moment," the guest said.
The two began dating in 2010 and announced their engagement last June.