The singer has been dating the Stranger Things actor for nearly four months – and though the pair haven't commented on the telltale bling that's been on Lily's finger since the start of November, they look seriously loved up each and every time they step out together in public!
The duo were seen taking in dinner and a show in August, and were spotted out on the London tube the next month. In October, Lily and David hit up an SNL after-party together, followed by a visit to Florida's Disney World later in the month. Lily also referred to David's bicep as "mine" on Instagram, giving a pretty big hint she's locked the actor down!
Lily also showed off her shiny accessory while on a mummy-daughter date with her two girls, eight-year-old Ethel and six-year-old Marnie Rose, at the European premiere of Frozen 2 in early November.
In 2011, the singer married her now ex-husband Sam Cooper, who is the father of her little girls, but the pair split in 2016, and their divorce was finalised in June last year.
Speaking to PEOPLE about the split, Lily said, "It was really sad. If I didn't think I was going to be married forever, I wouldn't have married,"
"It's a disappointment, but I think it was the right decision and it was necessary, and ultimately, I just want to make a safe and secure environment for my kids, and that was ironically the best way of doing that."