Ashlee Simpson and Evan Ross announced their engagement on Twitter Jan. 13 and shared a picture of the huge engagement ring. Credit: Courtesy Ashlee Simpson

She said yes! Ashlee Simpson and Evan Ross announced on Twitter Monday, Jan. 13 that they are engaged.

"My baby love and I are ENGAGED!!!" Simpson, 29, tweeted. "Hallelujah Hawaii !!!!!" She also shared a photo of herself posing in her husband-to-be's arms and showing off her huge new engagement ring.

Ross, 25, also posted the same photo and tweeted: "The love of my life said YES!!!!!!"

The younger sister of Jessica Simpson and son of Diana Ross took their romance public back in July. Ross told omg! Insider in November that Simpson was "the one," and said marriage was "for sure" in their future.

This will be Simpson's second marriage. She was previously wed to Fall Out Boy rocker Pete Wentz, with whom she has 5-year-old son, Bronx.