Joshua Jackson, Diane Kruger: Ten Is Enough ... We're Breaking Up

Diane Kruger and Joshua Jackson are saying deuces to their 10 year relationship.

Reps for both confirmed the split to TMZ. It's kinda odd timing -- the "Inglourious Basterds" star celebrated her 40th birthday over the weekend ... reportedly with Joshua.

The longtime couple shared a home in NYC. No word on who's moving out.