Evan Ross, 25, proposed to Ashlee Simpson, 29, during a vacation that the couple recently spent in Hawaii.
Simpson announced the engagement through a message posted on her Twitter account.
“My baby love and I are ENGAGED!!! Hallelujah Hawaii !!!!!,” she wrote.
Ross as well expressed his excitement regarding their engagement.
“The love of my life said YES!!!!!!” he wrote.
Rumors about the relationship first appeared in July 2013, after they were spotted leaving Sunset Marquis Hotel in L.A.
Ashlee Simpson was previously married to Pete Wentz from 2008 to 2011. The two have a son together, Bronx, 6.