Diane Kruger [1] is setting the rumor mill on fire this week thanks to a sparkly new accessory: the actress was spotted wearing a big, gorgeous diamond ring on her left ring finger on Tuesday, sparking speculation that she and longtime boyfriend Joshua Jackson [2] are engaged. Diane's new bling was on display as she and Joshua left a dinner party for designer Antonio Berardi in LA.

While it wouldn't be a total shock if the two decided to make it official — they've been dating since 2006 — Diane made comments to the contrary in a 2011 interview with Glamour [3], saying, "Without sounding pessimistic, I learned that I don't believe in marriage. I believe in a commitment that you make in your heart. There's no paper that will make you stay." Meanwhile, Joshua told reporters [4] the next year, "Never say never." So either the tide is turning for Diane and Josh, or the ring is just a beautiful piece of jewelry. Either way, we're happy to see these two out and about.

Joshua Jackson [5] and Diane Kruger [6] left an LA party together.

Diane showed off a new ring on her left hand.