The loved-up couple sparked engagement rumours last month when eagle-eyed Instagram fans noticed that both women were wearing matching rings in a video they'd posted while vacationing in Saint-Tropez.
"Cara Delevingne and Ashley Benson are officially ENGAGED..!!!?!?! can you hear me crying!?!?!?" one fan Tweeted. "Ashley Benson and Cara Delevingne got engaged, we won again gays," joked another Twitter user.
Although the pair have long been private about their relationship, Cara finally confirmed they were an item at the TrevorLIVE New York Gala in June. When asked about why she chose to go public with their romance, she said: "I don't know because it is Pride, it's been 50 years since Stonewall happened and I don't know. It's been just about our one year anniversary so, why not?"
WATCH: Cara and Ashley's cute date night in France
A source close to the happy couple also dished on their strong bond, revealing they're "very much in love".
"They are very sweet and loving together," an insider told E! News. "They are always doing simple nice things for each other and it all comes very easily and naturally. They are committed to one another and very much in love."