The 'Bring Me Some Water' hitmaker married Wallem on May 31 night in an intimate outdoor ceremony at the San Ysidro Ranch in Montecito, California, at the foot of the Santa Ynez Mountain range, reported People magazine.
"They were so happy. It was really beautiful," a guest said, adding that Etheridge wore a grey suit, while Wallem was in a white dress.
Etheridge sang Wallem a new song she wrote especially for her, which Etheridge had never performed before, not even to Wallem.
"The ceremony was such a beautiful start to the night," said the guest.
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"The setting was perfect. It was something Melissa and Linda wanted early on. It was as perfect as they envisioned," the guest added.
The newlyweds left directly for their honeymoon after their wedding.
The singer and the Nurse Jackie creator had been friends for more than a decade before they began dating in 2010.
Last June, they announced their engagement following the Supreme Court's historic decisions regarding gay rights, with Etheridge calling Wallem 'my true love'.