Best Mom Ever? Diana Ross Will Perform at Son Evan & Ashlee Simpson's Wedding!

Ashlee Simpson and Evan Ross' engagement party

Photos: Ashlee Simpson via Twitter

Ashlee Simpson and Evan Ross, who have been dating for less than a year and engaged for five months, are anxious to tie the knot! The celebrity couple have already nailed down one very important element of their big day: the music! The wedding singer of choice? Evan Ross's famed mother, Diana Ross — natch.

See more: See Photos from Ashlee Simpson and Evan Ross's Engagement Party

As mother-of-the-groom and one of the greatest singers of all time, it should come a no surprise that the disco diva plans to pick up the microphone and sing a tune or two at her son's reception. And according to E! News, Ross will be accompanied by her daughter and Evan's sister, Rhonda Ross Kendrick, on stage. They're not the only illustrious singers invited to the wedding, though: Smokey Robinson and Stevie Wonder will reportedly attend as well. Perhaps they'll take the stage as well?

While they're checking off all of the to-dos on the list, Evan admits he can't wait to marry Simpson. "Honestly, we could go and get married right now, wherever," he told E! while promoting his indie film, The Wilderness of James, at SXSW. "We just want to be married. We're in love. This is the most incredible time I could ever think of in my life and I'm young, but the same time, I've lived a different life than most and I can't think of a happier moment."

See more: Will Pete Wentz Beat Ashlee Simpson to the Altar?

Further proof of his passion for Simpson? He knew he wanted to marry "really quickly" once he met her. "I was giving it time only because I wanted to give it time, but I would have asked her a month after I was with her."

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