Ashlee Simpson Engaged To Actor Evan Ross

Jon Kopaloff/FilmMagic

Evan Ross and Ashlee Simpson arrive at the Los Angeles Premiere "The Hunger Games: Catching Fire" at Nokia Theatre L.A. Live on November 18, 2013 in Los Angeles, CA

Ashlee Simpson is tying the knot with actor Evan Ross, whom the pop singer has been dating since last July. Both Simpson and Ross shared the good news on Twitter on Monday night (Jan. 13).

"My baby love and I are ENGAGED!!! Hallelujah Hawaii !!!!!" Simpson wrote, attaching a glossy pic of the couple and showing off some new bling on her ring finger.

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Ross, the 25-year-old son of Diana Ross, has appeared in "Crazy Sexy Cool: The TLC Story" and "Jeff, Who Lives at Home," among other film projects. Next year, he will co-star in "The Hunger Games: Mockingjay - Part 1," the third installment of the blockbuster franchise.

Simpson shares a five-year-old son with Fall Out Boy bassist Pete Wentz, whom she divorced in 2011 after three years of marriage. The 29-year-old singer's last album, "Bittersweet World," was released in 2008.

Watch the video for Simpson's still-classic 2004 single "Pieces Of Me" below: