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On Tuesday evening Ashlee Simpson and Evan Ross stepped out in New York City for a date, and we still can't believe these two are getting ready to walk down the aisle later this summer!

As expected, Ash is planning a bohemian-style wedding, which will take place at Diana Ross’ Greenwich, Connecticut estate on August 31, and get this -- the legendary singer is set to perform at the couple's nuptials, according to E! News.

So how excited is Evan about marrying his sweetheart of nearly one year? "Honestly, we could go and get married right now, wherever," he said at SXSW earlier this spring. "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."