Things may have been a little awkward at Red O in L.A. last night -- when Jessica Simpson and ex-husband Nick Lachey had dinner dates there at the same time!

TooFab spotted Jessica and boyfriend Eric Johnson arriving at the restaurant at around 8pm last night -- only to have Lachey show up 40 minutes later. Nick was with GF Vanessa Minnillo.

Both couples appeared to be in good spirits when they left, separately, but no word on how things went inside the restaurant.

Nick and Jessica were married in 2002 but separated only 3 years later. The divorce was finalized in 2006.

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