"The wedding went perfectly," the Motown legend told US Weekly of the wedding, which took place on Sunday at Diana’s Connecticut estate.
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Diana Ross has spoken about son Evan's 'perfect' wedding to Ashlee Simpson
"We had a beautiful rainbow surrounding us, loving family and friends, great music and great speeches from loving and caring friends, and joyful children dancing the night away."
Diana played an important role in the big day, which was attended by 200 guests. Not only did she sing at the newlyweds' reception, she officiated the wedding ceremony.
She added, "I thank everyone who supported us on the spectacular day and our neighbours who were kind enough to let us have fun.
Ashlee Simpson and Evan Ross at their engagement party in March
"We had great friends who travelled from Norway, London, Switzerland and from all over the world.
"Wishing Evan and Ashlee congratulations," Diana, 70, said. "I want only love, happiness and joy for my son and his bride."
Ashlee and Evan's bohemian-style nuptials included a number of personal touches from the singer and her actor husband, including dream catchers and an aisle lit by white lanterns.
Evan Ross and Ashlee Simpson announced their engagement in January
Ashlee, 29, was walked down the aisle by her father and her five-year-old son Bronx, from her previous marriage to Pete Wentz.
Her big sister Jessica Simpson served as the maid of honour, and she walked down the aisle accompanied by her two children, Maxwell, two, and 14-month-old Ace.