Isopix

They went from "just friends" to inseparable in record time!

Nick Jonas and girlfriend Priyanka Chopra celebrated her 36th birthday in London this week, and the couple are so in love, they're making no attempt to hide it anymore!

The lovebirds enjoyed a double date with Joe Jonas and his fiancee Sophie Turner during their trip, and we're dying to know if they also popped around for a cup of tea with her bestie Meghan Markle!

The pair's relationship has gone from strength to strength in recent months, and now insiders are saying it's only a matter of time before the 25-year-old singer pops the question to his older lady love. They've already met each other's parents and moved in together, so it's the next logical step.

"[Nick and Priyanka] are infatuated with each other. Everyone around them thinks that they will be engaged within six months to a year," a source dished to E! News.

We hope this one has a fairytale ending!