Jessica Simpson and Eric Johnson Hang Out at Ashlee Simpson’s Vegas Show

Jessica Simpson and Eric Johnson might have gone to Las Vegas together, but they’re trying to keep a low profile while there … though it wasn’t easy for either of them to hide in a crowd at Jessica’s sister Ashlee‘s show.

The two were spotted at Voltaire — a popular nightclub in The Venetian Resort … chatting with a group of people.

No PDA between the pair here … but, they’re clearly comfortable spending time with one another — though video circulating online shows they put some distance between one another during Ashlee’s actual performance.

Check it out — Eric was nowhere near Jessica while Ash was singing … but, eagle-eyed fans who search the crowd will notice he’s standing just a little ways off — wearing a Georgia Institute of Technology cap.

It’s a bit hard to see his face in some of these snaps … but, it’s the same hat Eric was seen wearing when he and JS touched down in Sin City yesterday.

Remember … the two were photographed flying from Burbank to Vegas yesterday — with the pair touching down at Harry Reid International yesterday.

They were mum on reconciliation … and, there’s no PDA between the two in photos and videos from the concert — but, it seems like another hint that these two might be trying to thaw their frosty relationship.

As you know … Eric and Jessica announced their separation in January — though our sources say they’ve been apart for much, much longer than that.