The couple, who split in June after three years together, were spotted last weekend in Los Angeles making out in a booth at the bar Dime, completely unaware of anything in the world except each other.
Then, on Wednesday, the couple took it to the East Coast, where they hit a party at the bar McFadden’s with Entourage star Kevin Connolly. Lachey, 35, and Minnillo, 28, called it a night early and left at the unfashionable hour of 9 p.m.
Just the next day, the pair decided to spread the love to the Midwest, and were spotted together at Cincinnati’s new hot spot, The Righteous Room.
But don’t call them boyfriend-girlfriend just yet, a friend of the couple’s tells PEOPLE.
“Nick and Vanessa are not officially back together, but they’re hanging out,” the source says. “They’ll see what happens. Maybe a reconciliation will happen, but they’re not exclusive right now.”
• Reporting by DAVID CAPLAN and LESLEY MESSER
• 2007: After splitting with Jessica, Nick finds love with Vanessa