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Ashlee Simpson and Evan Ross are engaged, and the duo posted the pic above and happily tweeted the news on Monday afternoon.

Ash wrote, "My baby love and I are ENGAGED!!! Hallelujah Hawaii!!!!!" Evan added, "The love of my life said YES!!!!!!"

Ashlee, 29, and Evan, 25, started dating in July, but given how much the two gush about each other, this news doesn't come as a total shock. "It's amazing. I'm so in love," he told OMG! Insider back in November. "We [have] amazing things going on and we inspire each other…She [is] the one." Wow! And not only that, but when asked if he plans to marry his lady love, Evan exclaimed, "For sure!"

Simpson was married Fall Out Boy rocker Pete Wentz, with whom she has 5-year-old son, Bronx.