Diana Ross 'did the impossible' for son's wedding

Diana Ross pulled off the impossible with her son Evan's wedding to Ashlee Simpson.

The happy couple tied the knot last Sunday, in a lavish ceremony surrounded by friends and family.

The celebration was held at singing legend Diana's Connecticut home, and Evan admits the special day wouldn't have been possible without the support of his mom.

"Both of our mothers were involved on every level, helping us make our wedding the way we wanted it. We couldn't have done it without them," Evan smiled to the British edition of Hello! magazine.

"My mom really did the impossible. She has been working on this wedding for us every day for months - and has been on tour during the process."

Evan isn't the only one with an A-list family member, Ashlee's showbiz sister Jessica was also on hand to celebrate the big day.

Proceedings kicked off when 29-year-old Ashlee, who arrived in a horse-drawn-carriage, walked down the aisle. Her son Bronx, five, [from ex-husband Pete Wentz], watched from the sidelines wearing a dapper white suit jacket.

"Our vows were very sweet. Evan and I decided to keep them between us and our loved ones who were with us, but there were definitely tears and some laughs," Ashlee recalled.

Diana wowed guests with a rendition of her famous hit Endless Love, while they also feasted on a four-tiered red velvet cake.

After an eight month engagement, Ashlee couldn't wait to finally call Evan her husband.

"[The best thing] was just finally getting to be married to Evan and seeing all of our friends and family," Ashlee gushed.

"It is an incredible and overwhelming feeling to walk down the aisle and see all the faces of people you grew up with and who flew across the world to be there with you. It is probably the only time in your life when that many people you know are all together in one room."