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OTRC: Ashlee Simpson engaged to Evan Ross, son of Diana Ross (Photo)

Ashlee Simpson and Evan Ross appear in a Twitter photo posted on Jan. 13, 2014, in which she announced they are engaged. / Ashlee Simpson and Evan Ross are pictured with mother Diana Ross in a Twitter photo posted on Dec. 11, 2013. (pic.twitter.com/KVwoltverE / twitter.com/ashleesimpson/status/422890145121984512 / pic.twitter.com/5HKHnMTy3N / twitter.com/realevanross/status/410915445198159873/photo/1)

Ashlee Simpson is engaged!

The 29-year-old pop singer, actress and younger sister of Jessica Simpson is set to marry singer and actor Evan Ross, the 25-year-old son of R&B and soul legend Diana Ross. Both Ashlee and Evan announced the news on their Twitter pages on Monday, Jan. 13.

She and Evan first stepped out together in July. This will mark her second marriage. She shares a 5-year-old son, Bronx Mowgli, with ex-husband Pete Wentz of the band Fall Out Boy. They divorced in 2011 after three years of marriage.

"My baby love and I are ENGAGED!!!" Ashlee tweeted in an apparent nod to the famous 1964 song "Baby Love" by Diana Ross' former group, The Supremes.

She also shared a photo of herself with Evan, which shows her sporting an engagement ring, and said: "Hallelujah Hawaii !!!!!"

"The love of my life said YES!!!!!!" he tweeted, along with the same picture.

Both Ashlee and Evan starred in CW shows that were reboots of popular 1990s teen dramas. The actress played Violet Foster on the series "Melrose Place" between 2009 and 2010, while the actor starred as Charlie Selby on "90210" between 2010 and 2011. Ross is set to play Messalla in the upcoming two-part "The Hunger Games: Mockingjay" films. Part 1 is set for release in November.

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