Singer and actress Ashlee, 29, became engaged to Diana Ross' son during a romantic holiday to Hawaii in January 2014.
Ashlee and Evan, 25, celebrated with an engagement party at the end of March and have set a date for their big day – although so far they're keeping mum about when it is!
Evan, who plays Messalla in the upcoming Hunger Games: Mockingjay Part One, told E! News that the pair have picked the date and wedding planning is going smoothly thanks in part to his legendary mum Diana.
"She's involved in every piece of our wedding and engagement party," he said. "She's involved in all levels of my life. She's one of the most incredible mothers ever."
Diana was one of the guests at Ashlee and Evan's romantic and glamorous engagement party in March, alongside Ashee's sister Jessica Simpson, who is also engaged.
Evan popped the question to Ashlee six months after dating and says all they want to do now is marry and spend their lives together. "We just want to be married. We're in love. It's the most incredible time I could ever think of in my life."
This will be Ashlee's second marriage. She was previously married to Fall Out Boy star Pete Wentz, the father of her five-year-old son Bronx.
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Celebrities who became engaged in 2014 in pictures:
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