Ashlee Simpson, 29, is engaged to actor Evan Ross, People magazine reports.

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"The love of my life said YES!!!!!!" Ross, 25, announced Monday on Twitter, sharing a photo of the couple. Adds Simpson, "My baby love and I are ENGAGED!!! Hallelujah Hawaii!!!"

The couple went public with their relationship in July, and Simpson was spotted spending time with her future mother-in-law, Diana Ross, at a concert after-party in August. At a movie premiere in November, Evan Ross hinted at the pair's future, saying, "She's the one." Simpson has a son, Bronx Mowgli, 5, from her previous marriage to Fall Out Boy band member Pete Wentz.